ci: split workflows into separate CI and Docker jobs

- Split ci.yml into two workflows for cleaner PR checks
- ci.yml: runs build-and-test on PRs and pushes (no Docker)
- docker.yml: runs build-and-test + Docker build/push on merges, tags, and manual triggers
- Eliminates 'docker: skipping' status on open PRs

.github/workflows/ci.yml

@@ -1,25 +1,18 @@
-name: CI/CD
+name: CI
 
 on:
-  workflow_dispatch:
   push:
-    tags: ['v*']
+    branches: [master, dev]
   pull_request:
-    types: [closed]
+    types: [opened, synchronize, reopened]
     branches: [master, dev]
 
 env:
   DOTNET_VERSION: "9.0.x"
-  REGISTRY: ghcr.io
-  IMAGE_NAME: ${{ github.repository }}
 
 jobs:
   build-and-test:
     runs-on: ubuntu-latest
-    if: |
-      github.event_name == 'workflow_dispatch' ||
-      github.event_name == 'push' ||
-      (github.event_name == 'pull_request' && github.event.pull_request.merged == true)
 
     steps:
       - name: Checkout
@@ -38,53 +31,3 @@ jobs:
 
       - name: Test
         run: dotnet test --configuration Release --no-build --verbosity normal
-
-  docker:
-    needs: build-and-test
-    runs-on: ubuntu-latest
-
-    permissions:
-      contents: read
-      packages: write
-
-    steps:
-      - name: Checkout
-        uses: actions/checkout@v4
-
-      - name: Set up QEMU
-        uses: docker/setup-qemu-action@v3
-
-      - name: Set up Docker Buildx
-        uses: docker/setup-buildx-action@v3
-
-      - name: Login to GitHub 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: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
-          tags: |
-            type=ref,event=branch
-            type=sha,prefix=
-            type=semver,pattern={{version}}
-            type=semver,pattern={{major}}.{{minor}}
-            type=semver,pattern={{major}}
-            type=raw,value=latest,enable=${{ github.ref == 'refs/heads/master' }}
-            type=raw,value=dev,enable=${{ github.ref == 'refs/heads/dev' }}
-
-      - name: Build and push
-        uses: docker/build-push-action@v6
-        with:
-          context: .
-          platforms: linux/amd64,linux/arm64
-          push: true
-          tags: ${{ steps.meta.outputs.tags }}
-          labels: ${{ steps.meta.outputs.labels }}
-          cache-from: type=gha
-          cache-to: type=gha,mode=max