Fix docker image CI for pull requests (#84)

Closes #65

Pull request images will now be `ttl.sh/techaro/pr-{number}/anubis:24h`.

.github/workflows/docker-pr.yml

@@ -0,0 +1,44 @@
+name: Docker image builds (pull requests)
+
+on:
+  pull_request:
+    branches: [ "main" ]
+
+env:
+  DOCKER_METADATA_SET_OUTPUT_ENV: "true"
+
+permissions:
+  contents: read
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+        with:
+          fetch-tags: true
+          fetch-depth: 0
+
+      - uses: actions/setup-go@v5
+        with:
+          go-version: '1.24.x'
+
+      - uses: ko-build/setup-ko@v0.8
+
+      - name: Docker meta
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: ghcr.io/techarohq/anubis
+
+      - name: Build and push
+        id: build
+        run: |
+          go run ./cmd/containerbuild --docker-repo ghcr.io/techarohq/anubis --slog-level debug
+        env:
+          PULL_REQUEST_ID: ${{ github.event.number }}
+
+      - run: |
+          echo "Test this with:"
+          echo "docker pull ${{ steps.build.outputs.docker_image }}"

.github/workflows/docker.yml

@@ -5,8 +5,6 @@ on:
   push:
     branches: [ "main" ]
     tags: [ "v*" ]
-  pull_request:
-    branches: [ "main" ]
 
 env:
   DOCKER_METADATA_SET_OUTPUT_ENV: "true"
@@ -28,12 +26,6 @@ jobs:
           fetch-tags: true
           fetch-depth: 0
 
-      - name: Set up QEMU
-        uses: docker/setup-qemu-action@v3
-
-      - name: Set up Docker Buildx
-        uses: docker/setup-buildx-action@v3
-
       - uses: actions/setup-go@v5
         with:
           go-version: '1.24.x'
@@ -57,20 +49,6 @@ jobs:
         id: build
         run: |
           go run ./cmd/containerbuild --docker-repo ghcr.io/techarohq/anubis --slog-level debug
-        env:
-          PULL_REQUEST_ID: ${{ github.event.number }}
-
-      # - name: "Comment about where to test this"
-      #   uses: thollander/actions-comment-pull-request@v3
-      #   if: ${{github.event_name == 'pull_request'}}
-      #   with:
-      #     message: |
-      #       You can try this PR out by using the following docker image:
-
-      #       ```
-      #       ${{ steps.build.outputs.docker_image }}
-      #       ```
-      #     comment-tag: ${{ steps.build.outputs.docker_image }}
       
       - name: Generate artifact attestation
         uses: actions/attest-build-provenance@v2

cmd/containerbuild/main.go

@@ -23,21 +23,8 @@ var (
 	githubEventName   = flag.String("github-event-name", "", "GitHub event name")
 	pullRequestID     = flag.Int("pull-request-id", -1, "GitHub pull request ID")
 	slogLevel         = flag.String("slog-level", "INFO", "logging level (see https://pkg.go.dev/log/slog#hdr-Levels)")
-
-	knownContributors = []string{
-		"Xe",
-	}
 )
 
-func inList(needle string, haystack []string) bool {
-	for _, h := range haystack {
-		if h == needle {
-			return true
-		}
-	}
-	return false
-}
-
 func main() {
 	flagenv.Parse()
 	flag.Parse()
@@ -46,11 +33,7 @@ func main() {
 
 	koDockerRepo := strings.TrimRight(*dockerRepo, "/"+filepath.Base(*dockerRepo))
 
-	if *githubEventName == "pull_request" && !inList(*githubActor, knownContributors) {
-		if *pullRequestID == -1 {
-			log.Fatal("Must set --pull-request-id when --github-event-name=pull_request")
-		}
-
+	if *githubEventName == "pull_request" && *pullRequestID != -1 {
 		*dockerRepo = fmt.Sprintf("ttl.sh/techaro/pr-%d/anubis", *pullRequestID)
 		*dockerTags = fmt.Sprintf("ttl.sh/techaro/pr-%d/anubis:24h", *pullRequestID)
 		koDockerRepo = fmt.Sprintf("ttl.sh/techaro/pr-%d", *pullRequestID)