fix(ci): docker metadata image tags

- Move metata as top step in publish workflow
- Simplify `v0.x.x` check
- Dynamically determine base branch

.github/workflows/ci.yml

@@ -42,7 +42,12 @@ jobs:
     env:
       DOCKER_BUILDKIT: "1"
     steps:
-      - uses: actions/checkout@v2.4.0
+      - uses: actions/checkout@v3
+
+      - uses: reviewdog/action-misspell@v1
+        with:
+          locale: "US"
+          level: error
 
       - name: Linting
         run: docker build --target lint .
@@ -84,7 +89,26 @@ jobs:
     needs: [verify]
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2.4.0
+      - uses: actions/checkout@v3
+
+      # extract metadata (tags, labels) for Docker
+      # https://github.com/docker/metadata-action
+      - name: Extract Docker metadata
+        id: meta
+        uses: docker/metadata-action@v3
+        with:
+          flavor: |
+            latest=${{ github.ref == format('refs/heads/{0}', github.event.repository.default_branch) }}
+          images: |
+            qmcgaw/gluetun
+            qmcgaw/private-internet-access
+          tags: |
+            type=ref,event=branch,enable=${{ github.ref != format('refs/heads/{0}', github.event.repository.default_branch) }}
+            type=ref,event=pr
+            type=semver,pattern=v{{major}}.{{minor}}.{{patch}}
+            type=semver,pattern=v{{major}}.{{minor}}
+            type=semver,pattern=v{{major}},enable=${{ !startsWith(github.ref, 'refs/tags/v0.') }}
+            type=raw,value=latest,enable=${{ github.ref == format('refs/heads/{0}', github.event.repository.default_branch) }}
 
       - uses: docker/setup-qemu-action@v1
       - uses: docker/setup-buildx-action@v1
@@ -94,45 +118,12 @@ jobs:
           username: qmcgaw
           password: ${{ secrets.DOCKERHUB_PASSWORD }}
 
-      - name: Check for semver tag
-        id: semvercheck
-        run: |
-          if [[ ${{ github.ref }} =~ ^refs\/tags\/v0\.[0-9]+\.[0-9]+$ ]]; then
-            MATCH=true
-          else
-            MATCH=false
-          fi
-          if [[ ${{ github.ref }} =~ ^refs\/tags\/v[1-9]+\.[0-9]+\.[0-9]+$ ]]; then
-            MATCH=$MATCH_nonzero
-          fi
-          echo ::set-output name=match::$MATCH
-
-      # extract metadata (tags, labels) for Docker
-      # https://github.com/docker/metadata-action
-      - name: Extract Docker metadata
-        id: meta
-        uses: docker/metadata-action@v3
-        with:
-          flavor: |
-            latest=${{ github.ref == 'refs/heads/master' }}
-          images: |
-            qmcgaw/gluetun
-            qmcgaw/private-internet-access
-          tags: |
-            type=ref,event=branch,enable=${{ github.ref != 'refs/heads/master' }}
-            type=ref,event=pr
-            type=ref,event=tag,enable=${{ !startsWith(steps.semvercheck.outputs.match, 'true') }}
-            type=semver,pattern=v{{major}}.{{minor}}.{{patch}},enable=${{ startsWith(steps.semvercheck.outputs.match, 'true') }}
-            type=semver,pattern=v{{major}}.{{minor}},enable=${{ startsWith(steps.semvercheck.outputs.match, 'true') }}
-            type=semver,pattern=v{{major}},enable=${{ startsWith(steps.semvercheck.outputs.match, 'true_nonzero') }}
-            type=raw,value=latest,enable=${{ !startsWith(steps.semvercheck.outputs.match, 'true') }}
-
       - name: Short commit
         id: shortcommit
         run: echo "::set-output name=value::$(git rev-parse --short HEAD)"
 
       - name: Build and push final image
-        uses: docker/build-push-action@v2.7.0
+        uses: docker/build-push-action@v2.9.0
         with:
           platforms: linux/amd64,linux/386,linux/arm64,linux/arm/v6,linux/arm/v7,linux/ppc64le
           labels: ${{ steps.meta.outputs.labels }}