🤖 ci: split goreleaser docker tags by channel

Avoid rendering an empty Docker tag in main-channel GoReleaser runs by
using separate dockers_v2 entries with channel-specific disable rules.
This keeps `:main` and release tags explicit and always non-empty.

---

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Author: ThomasK33

.goreleaser.yaml

@@ -30,15 +30,15 @@ release:
   disable: '{{ eq .Env.GORELEASER_CHANNEL "main" }}'
 
 dockers_v2:
-  - id: coder-k8s-image
+  - id: coder-k8s-image-main
+    disable: '{{ ne .Env.GORELEASER_CHANNEL "main" }}'
     dockerfile: Dockerfile.goreleaser
     ids:
       - coder-k8s
     images:
       - ghcr.io/coder/coder-k8s
     tags:
-      - '{{ if eq .Env.GORELEASER_CHANNEL "main" }}main{{ else }}{{ .Version }}{{ end }}'
-      - '{{ if ne .Env.GORELEASER_CHANNEL "main" }}latest{{ end }}'
+      - main
     platforms:
       - linux/amd64
       - linux/arm64
@@ -50,7 +50,37 @@ dockers_v2:
       org.opencontainers.image.documentation: https://coder.github.io/coder-k8s/
       org.opencontainers.image.title: coder-k8s
       org.opencontainers.image.description: Kubernetes operator for Coder
-      org.opencontainers.image.version: '{{ if eq .Env.GORELEASER_CHANNEL "main" }}main{{ else }}{{ .Version }}{{ end }}'
+      org.opencontainers.image.version: main
+      org.opencontainers.image.revision: "{{ .FullCommit }}"
+      org.opencontainers.image.vendor: Coder
+      org.opencontainers.image.licenses: Apache-2.0
+      org.opencontainers.image.authors: Coder
+    flags:
+      - "--pull=true"
+      - "--provenance=false"
+
+  - id: coder-k8s-image-release
+    disable: '{{ eq .Env.GORELEASER_CHANNEL "main" }}'
+    dockerfile: Dockerfile.goreleaser
+    ids:
+      - coder-k8s
+    images:
+      - ghcr.io/coder/coder-k8s
+    tags:
+      - "{{ .Version }}"
+      - latest
+    platforms:
+      - linux/amd64
+      - linux/arm64
+    sbom: false
+    labels:
+      org.opencontainers.image.created: "{{ .Date }}"
+      org.opencontainers.image.source: https://github.com/coder/coder-k8s
+      org.opencontainers.image.url: https://coder.github.io/coder-k8s/
+      org.opencontainers.image.documentation: https://coder.github.io/coder-k8s/
+      org.opencontainers.image.title: coder-k8s
+      org.opencontainers.image.description: Kubernetes operator for Coder
+      org.opencontainers.image.version: "{{ .Version }}"
       org.opencontainers.image.revision: "{{ .FullCommit }}"
       org.opencontainers.image.vendor: Coder
       org.opencontainers.image.licenses: Apache-2.0