Simplify PR github action (#196)

.github/workflows/pr.yml

@@ -3,54 +3,13 @@ name: Validate PR
 on:
   pull_request:
     branches: [ master ]
-    types: [assigned, opened, synchronize, labeled]
-
-env:
-  IMAGE_TO_TEST: itzg/mc-router:test-${{ github.repository_owner }}-${{ github.run_id }}
 
 jobs:
   test:
     runs-on: ubuntu-20.04
-
     steps:
       - uses: actions/checkout@v3
-
-      - name: Setup Docker Buildx
-        uses: docker/setup-buildx-action@v2
-
-      - name: Build
-        uses: docker/build-push-action@v3.3.0
+      - uses: actions/setup-go@v4
         with:
-          tags: ${{ env.IMAGE_TO_TEST }}
-          load: true
-          cache-from: type=gha
-          target: builder
-
-      - name: Run tests
-        run: |
-          docker run --rm --entrypoint go ${{ env.IMAGE_TO_TEST }} test ./...
-
-      - name: Gather Docker metadata
-        if: contains(github.event.pull_request.labels.*.name, 'ci/push-image')
-        id: meta
-        uses: docker/metadata-action@v4
-        with:
-          images: |
-            itzg/mc-router
-
-      - name: Login to DockerHub
-        if: contains(github.event.pull_request.labels.*.name, 'ci/push-image')
-        uses: docker/login-action@v2
-        with:
-          username: ${{ secrets.DOCKERHUB_USERNAME }}
-          password: ${{ secrets.DOCKERHUB_TOKEN }}
-
-      - name: Push
-        if: contains(github.event.pull_request.labels.*.name, 'ci/push-image')
-        uses: docker/build-push-action@v3.3.0
-        with:
-          tags: ${{ steps.meta.outputs.tags }}
-          pull: true
-          push: true
-          cache-from: type=gha
-          labels: ${{ steps.meta.outputs.labels }}
+          go-version-file: 'go.mod'
+      - run: go test ./...

.github/workflows/release.yml

@@ -20,7 +20,7 @@ jobs:
       - name: Set up Go
         uses: actions/setup-go@v4
         with:
-          go-version: 1.20
+          go-version-file: 'go.mod'
 
       - name: Setup docker buildx
         uses: docker/setup-buildx-action@v2