ghactions: Skip yocto-check-layer on tag

There is no reason to run this job when tagging and it takes a long time
so skip it.

.github/workflows/build-and-test.yaml

@@ -95,6 +95,8 @@ jobs:
           ./meta-bitbake-hashserver/scripts/validate-layer-json.py
 
   yocto-check-layer:
+    # Don't run this on tag pushes
+    if: github.event_name != 'push' || ! startsWith(github.ref, 'refs/tags/')
     needs:
       - create-layer-cache
 
@@ -283,6 +285,7 @@ jobs:
           podman run --rm -it localhost/bitbake-hashserver-test-container-image:latest
 
   publish:
+    if: github.event_name == 'push'
     needs:
       - build
       - test
@@ -300,12 +303,10 @@ jobs:
           name: "${{ env.IMAGE_NAME }}-${{ env.MACHINE }}-oci"
 
       - name: Login to registry
-        if: ${{ github.event_name == 'push' }}
         run: |
           echo "${{ secrets.GITHUB_TOKEN }}" | skopeo login ghcr.io --username $ --password-stdin
 
       - name: Push image
-        if: ${{ github.event_name == 'push' }}
         run: |
           IMAGE_ID=ghcr.io/${{ github.repository_owner }}/$IMAGE_NAME