Fix CI: run jobs on host, use plain docker shell steps

The previous workflow ran jobs inside node:20-bookworm which has no
Docker CLI. Re-mapped label to :host and replaced composite actions
with direct docker build/push shell commands.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

.gitea/workflows/docker.yml

@@ -10,72 +10,37 @@ env:
   REGISTRY: git.hexadual.io
 
 jobs:
-  server:
-    name: Server image
+  build:
+    name: Build & push all images
     runs-on: ubuntu-latest
-    permissions:
-      contents: read
-      packages: write
 
     steps:
-      - uses: actions/checkout@v4
+      - name: Checkout
+        uses: actions/checkout@v4
 
-      - name: Log in to Gitea container registry
-        uses: docker/login-action@v3
-        with:
-          registry: ${{ env.REGISTRY }}
-          username: ${{ github.actor }}
-          password: ${{ secrets.GITHUB_TOKEN }}
+      - name: Log in to registry
+        run: |
+          echo "${{ secrets.GITHUB_TOKEN }}" | \
+            docker login ${{ env.REGISTRY }} -u ${{ github.actor }} --password-stdin
 
-      - name: Extract metadata
-        id: meta
-        uses: docker/metadata-action@v5
-        with:
-          images: ${{ env.REGISTRY }}/rocobo/gcp-dot-server
-          tags: |
-            type=raw,value=latest,enable={{is_default_branch}}
-            type=semver,pattern={{version}}
-            type=sha,prefix=sha-,format=short
+      - name: Build & push server
+        run: |
+          docker build \
+            -t ${{ env.REGISTRY }}/rocobo/gcp-dot-server:latest \
+            -t ${{ env.REGISTRY }}/rocobo/gcp-dot-server:${{ github.sha }} \
+            ./server
+          docker push ${{ env.REGISTRY }}/rocobo/gcp-dot-server:latest
+          docker push ${{ env.REGISTRY }}/rocobo/gcp-dot-server:${{ github.sha }}
 
-      - name: Build and push server image
-        uses: docker/build-push-action@v5
-        with:
-          context: ./server
-          push: true
-          tags: ${{ steps.meta.outputs.tags }}
-          labels: ${{ steps.meta.outputs.labels }}
+      - name: Build & push egg
+        run: |
+          docker build \
+            -t ${{ env.REGISTRY }}/rocobo/gcp-dot-egg:latest \
+            -t ${{ env.REGISTRY }}/rocobo/gcp-dot-egg:${{ github.sha }} \
+            ./egg
+          docker push ${{ env.REGISTRY }}/rocobo/gcp-dot-egg:latest
+          docker push ${{ env.REGISTRY }}/rocobo/gcp-dot-egg:${{ github.sha }}
 
-  egg:
-    name: Egg image
-    runs-on: ubuntu-latest
-    permissions:
-      contents: read
-      packages: write
-
-    steps:
-      - uses: actions/checkout@v4
-
-      - name: Log in to Gitea container registry
-        uses: docker/login-action@v3
-        with:
-          registry: ${{ env.REGISTRY }}
-          username: ${{ github.actor }}
-          password: ${{ secrets.GITHUB_TOKEN }}
-
-      - name: Extract metadata
-        id: meta
-        uses: docker/metadata-action@v5
-        with:
-          images: ${{ env.REGISTRY }}/rocobo/gcp-dot-egg
-          tags: |
-            type=raw,value=latest,enable={{is_default_branch}}
-            type=semver,pattern={{version}}
-            type=sha,prefix=sha-,format=short
-
-      - name: Build and push egg image
-        uses: docker/build-push-action@v5
-        with:
-          context: ./egg
-          push: true
-          tags: ${{ steps.meta.outputs.tags }}
-          labels: ${{ steps.meta.outputs.labels }}
+      - name: Logout
+        if: always()
+        run: docker logout ${{ env.REGISTRY }}