Move from snapcache repo

Copy benchmark and environment from
https://github.com/staticweb-io/snapcache

Author: john-shaffer

.editorconfig

@@ -0,0 +1,3 @@
+[*.php]
+indent_style = space
+indent_size = 4

.envrc

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+#!/bin/sh
+
+use flake

.github/workflows/build.yml

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+name: build
+
+on:
+  push:
+    branches:
+      - master
+    paths-ignore:
+      - '**.md'
+      - 'update.json'
+    tags:
+      - 'v*'
+  pull_request:
+    branches:
+      - master
+    paths-ignore:
+      - '**.md'
+      - 'update.json'
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    name: Build
+
+    steps:
+      - name: Checkout repo
+        uses: actions/checkout@v4
+
+      - name: Install Nix
+        uses: DeterminateSystems/determinate-nix-action@v3
+
+      - name: Build all checks and outputs
+        run: |
+          bin/test-releases 2
+          bin/test-php-versions 2
+          nix develop ./dev -c om ci
+          cd dev
+          nix develop -c om ci
+
+      - name: Build plugin zip
+        run: |
+          nix build .#plugin
+          cp result/snapcache.zip plugin.zip
+
+      - name: Upload plugin as artifact
+        uses: actions/upload-artifact@v4
+        with:
+          name: plugin
+          path: plugin.zip
+
+      - name: Create Snapshot Release
+        uses: softprops/action-gh-release@v2
+        with:
+          files: plugin.zip
+          name: snapshot
+          prerelease: true
+          tag_name: snapshot
+
+      - name: Create Stable Release
+        if: startsWith(github.ref, 'refs/tags/v')
+        uses: softprops/action-gh-release@v2
+        with:
+          files: plugin.zip

.gitignore

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+.*
+!.editorconfig
+!.envrc
+!.github
+!.gitignore
+!.kiro
+!.vscode
+
+/vendor/
+/vendor_prefixed/
+node_modules/
+bench*.json
+coverage/
+data
+flame*.svg
+admin/*.js*
+*.img
+*.pid
+plot*.png
+result
+result-*

.vscode/settings.json

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+{
+  "intelephense.files.exclude": [
+    "**/.git/**",
+    "**/.svn/**",
+    "**/.hg/**",
+    "**/CVS/**",
+    "**/.DS_Store/**",
+    "**/dev/data/**",
+    "**/node_modules/**",
+    "**/bower_components/**",
+    "**/result/**",
+    "**/result-*/**",
+    "**/vendor/**/{Tests,tests}/**",
+    "**/.history/**",
+    "**/vendor/**/vendor/**",
+    "/nix/store/**"
+  ],
+  "intelephense.stubs": [
+    "apache",
+    "apcu",
+    "bcmath",
+    "bz2",
+    "calendar",
+    "com_dotnet",
+    "Core",
+    "ctype",
+    "curl",
+    "date",
+    "dba",
+    "dom",
+    "enchant",
+    "exif",
+    "FFI",
+    "fileinfo",
+    "filter",
+    "fpm",
+    "ftp",
+    "gd",
+    "gettext",
+    "gmp",
+    "hash",
+    "iconv",
+    "imagick",
+    "imap",
+    "intl",
+    "json",
+    "ldap",
+    "libxml",
+    "mbstring",
+    "memcached",
+    "meta",
+    "mysqli",
+    "oci8",
+    "odbc",
+    "openssl",
+    "pcntl",
+    "pcre",
+    "PDO",
+    "pgsql",
+    "Phar",
+    "posix",
+    "pspell",
+    "random",
+    "readline",
+    "redis",
+    "Reflection",
+    "session",
+    "shmop",
+    "SimpleXML",
+    "snmp",
+    "soap",
+    "sockets",
+    "sodium",
+    "SPL",
+    "sqlite3",
+    "standard",
+    "superglobals",
+    "sysvmsg",
+    "sysvsem",
+    "sysvshm",
+    "tidy",
+    "tokenizer",
+    "wordpress",
+    "xml",
+    "xmlreader",
+    "xmlrpc",
+    "xmlwriter",
+    "xsl",
+    "Zend OPcache",
+    "zip",
+    "zlib"
+  ]
+}