ci: move reusable workflows to reusable actions

[jvbriones]

Migrates some GH workflows to reusable actions.

follow-up PR of these:

• refactor!: Migrate remaining workflows to actions github-tools#169
• refactor!: Migrate remaining release-related workflows to actions github-tools#168

Description

Changelog

CHANGELOG entry:

Related issues

Fixes:

Manual testing steps

1. Go to this page...

Screenshots/Recordings

Before

After

Pre-merge author checklist

• I've followed MetaMask Contributor Docs and MetaMask Extension Coding Standards.
• I've completed the PR template to the best of my ability
• I’ve included tests if applicable
• I’ve documented my code using JSDoc format if applicable
• I’ve applied the right labels on the PR (see labeling guidelines). Not required for external contributors.

Pre-merge reviewer checklist

• I've manually tested the PR (e.g. pull and build branch, run the app, test code being changed).
• I confirm that this PR addresses all acceptance criteria described in the ticket it closes and includes the necessary testing evidence such as recordings and or screenshots.

---

Note

Migrates three GitHub workflows from reusable workflows to MetaMask reusable actions, adds manual triggers where applicable, and updates inputs to kebab-case with explicit runners.

• CI workflows migrated to reusable actions:
  • check-pr-max-lines: Replace reusable workflow with MetaMask/github-tools/.github/actions/pr-line-check@v1; add runs-on: ubuntu-latest; update inputs to kebab-case (max-lines, ignore-patterns).
  • flaky-test-report: Add workflow_dispatch; replace reusable workflow with .../actions/flaky-test-report@v1; add runs-on; pass inputs via with (including workflow-id, github-token, slack-webhook-flaky-tests).
  • post-merge-validation: Add workflow_dispatch; replace reusable workflow with .../actions/post-merge-validation@v1; add runs-on; update inputs (start-hour-utc, github-token, google-application-creds-base64).

^{Written by Cursor Bugbot for commit 148bb80. This will update automatically on new commits. Configure here.}

[github-actions]

CLA Signature Action: All authors have signed the CLA. You may need to manually re-run the blocking PR check if it doesn't pass in a few minutes.

[metamaskbot]

Builds ready [148bb80]

• builds: chrome, firefox
• builds (beta): chrome, firefox
• builds (flask): chrome, firefox
• builds (test): chrome, firefox
• builds (test-flask): chrome, firefox
• bundle size: Bundle Size Stats
• user-actions-benchmark: User Actions Stats
• storybook: Storybook
• typescript migration: Dashboard
• all artifacts
• bundle viz:

  • background: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9
  • common: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15
  • ui: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16
  • content-script: 0
  • offscreen: 0

UI Startup Metrics (1208 ± 108 ms)

Platform	BuildType	Page	Metric	Mean (ms)	Min (ms)	Max (ms)	Std Dev (ms)	P 75 (ms)	P 95 (ms)
Chrome	Browserify	Standard Home	uiStartup	1208	1004	1573	108	1259	1400
			load	1025	858	1330	96	1085	1187
			domContentLoaded	1019	854	1307	94	1081	1184
			domInteractive	26	14	111	25	20	104
			firstPaint	490	85	1348	382	959	1138
			backgroundConnect	213	198	249	10	220	232
			firstReactRender	28	18	128	12	32	44
			getState	32	18	89	11	36	52
			initialActions	1	0	7	1	1	3
			loadScripts	812	650	1092	92	852	968
			setupStore	11	7	29	4	11	22
			numNetworkReqs	12	5	78	20	5	73
	Browserify	Power User Home	uiStartup	1964	1655	2597	210	2065	2464
			load	1037	916	1871	186	1011	1557
			domContentLoaded	1024	904	1862	185	995	1545
			domInteractive	44	18	275	53	32	197
			firstPaint	635	125	1869	447	994	1495
			backgroundConnect	226	207	261	11	232	243
			firstReactRender	89	54	159	20	97	132
			getState	177	130	303	33	196	245
			initialActions	1	0	3	1	1	3
			loadScripts	813	702	1647	184	784	1328
			setupStore	21	10	53	9	25	37
			numNetworkReqs	145	69	317	55	177	298
	Webpack	Standard Home	uiStartup	816	703	1086	75	847	996
			load	635	561	854	68	652	797
			domContentLoaded	631	557	848	68	649	790
			domInteractive	27	15	128	25	22	98
			firstPaint	208	93	658	120	215	599
			backgroundConnect	10	5	37	6	10	16
			firstReactRender	27	19	47	6	31	37
			getState	27	13	57	11	36	48
			initialActions	1	0	3	1	1	1
			loadScripts	628	555	839	66	647	781
			setupStore	11	6	32	5	12	21
			numNetworkReqs	12	5	77	20	5	74
	Webpack	Power User Home	uiStartup	1452	1110	2186	191	1555	1815
			load	674	583	1291	130	665	1020
			domContentLoaded	665	577	1284	130	653	1012
			domInteractive	43	18	319	53	32	175
			firstPaint	286	87	945	190	357	633
			backgroundConnect	14	7	42	6	17	28
			firstReactRender	84	51	105	13	93	103
			getState	150	124	227	17	158	191
			initialActions	1	0	2	0	1	2
			loadScripts	662	574	1273	128	650	1002
			setupStore	21	5	60	14	25	51
			numNetworkReqs	147	65	346	59	192	296
Firefox	Browserify	Standard Home	uiStartup	1216	1063	1705	124	1269	1458
			load	1024	910	1386	92	1075	1189
			domContentLoaded	1023	905	1385	92	1075	1189
			domInteractive	57	29	239	38	75	134
			firstPaint	-	-	-	-	-	-
			backgroundConnect	37	21	223	30	36	90
			firstReactRender	21	17	48	5	21	34
			getState	9	5	39	5	8	19
			initialActions	1	0	2	0	1	2
			loadScripts	1001	895	1267	80	1055	1155
			setupStore	10	5	36	6	9	23
			numNetworkReqs	12	5	68	16	6	64
	Browserify	Power User Home	uiStartup	2541	2055	3465	281	2710	3115
			load	1156	982	1723	171	1161	1516
			domContentLoaded	1155	977	1723	171	1160	1516
			domInteractive	128	35	750	128	115	453
			firstPaint	-	-	-	-	-	-
			backgroundConnect	136	31	668	138	127	566
			firstReactRender	86	52	167	20	96	135
			getState	301	68	917	226	443	819
			initialActions	2	1	20	2	2	7
			loadScripts	1118	958	1693	164	1128	1490
			setupStore	139	7	795	191	114	669
			numNetworkReqs	92	62	215	45	77	201
	Webpack	Standard Home	uiStartup	1448	1244	1957	141	1490	1793
			load	1221	1062	1453	96	1297	1425
			domContentLoaded	1221	1061	1453	96	1297	1425
			domInteractive	55	27	174	33	78	127
			firstPaint	-	-	-	-	-	-
			backgroundConnect	40	18	179	26	41	106
			firstReactRender	27	19	76	8	31	37
			getState	15	6	161	23	12	48
			initialActions	1	0	2	1	1	2
			loadScripts	1197	1047	1409	88	1272	1372
			setupStore	14	6	130	18	12	61
			numNetworkReqs	11	5	67	16	6	62
	Webpack	Power User Home	uiStartup	2676	2202	3489	315	2893	3267
			load	1355	1087	1932	212	1365	1810
			domContentLoaded	1354	1086	1932	212	1365	1810
			domInteractive	123	29	624	140	103	512
			firstPaint	-	-	-	-	-	-
			backgroundConnect	117	26	568	114	121	445
			firstReactRender	83	43	153	18	89	119
			getState	282	85	860	236	410	798
			initialActions	4	1	57	8	2	8
			loadScripts	1317	1071	1883	206	1317	1789
			setupStore	120	6	748	176	100	648
			numNetworkReqs	92	63	211	42	78	196

📊 Page Load Benchmark Results

Current Commit: 148bb80 | Date: 11/24/2025

📄 Localhost MetaMask Test Dapp

Samples: 100

Summary

• pageLoadTime-> current mean value: 1.06s (±39ms) 🟡 | historical mean value: 1.04s ⬆️ (historical data)
• domContentLoaded-> current mean value: 735ms (±37ms) 🟢 | historical mean value: 727ms ⬆️ (historical data)
• firstContentfulPaint-> current mean value: 78ms (±11ms) 🟢 | historical mean value: 80ms ⬇️ (historical data)

📈 Detailed Results

Metric	Mean	Std Dev	Min	Max	P95	P99
pageLoadTime	1.06s	39ms	1.01s	1.33s	1.10s	1.33s
domContentLoaded	735ms	37ms	701ms	996ms	772ms	996ms
firstPaint	78ms	11ms	64ms	168ms	88ms	168ms
firstContentfulPaint	78ms	11ms	64ms	168ms	88ms	168ms
largestContentfulPaint	0ms	0ms	0ms	0ms	0ms	0ms

Bundle size diffs [🚨 Warning! Bundle size has increased!]

• background: 53 Bytes (0%)
• ui: 0 Bytes (0%)
• common: 20 Bytes (0%)