Making Docker push only if Dockerfile changed

.github/workflows/docker-build.yml

@@ -16,16 +16,3 @@ jobs:
       - name: Docker-compose build
         run: |
           docker compose build
-      
-      - name: Log in to GitHub Container Registry
-        if: github.ref == 'refs/heads/main'
-        uses: docker/login-action@v1
-        with:
-          registry: ghcr.io
-          username: ${{ github.actor }}
-          password: ${{ secrets.GITHUB_TOKEN }}
-
-      - name: Push nginx image to GitHub Container Registry
-        if: github.ref == 'refs/heads/main'
-        run: |
-          docker push ghcr.io/flavienbwk/nginx-keycloak/nginx-sso:$(grep -oP "(?<=image: ghcr.io/flavienbwk/nginx-keycloak/nginx-sso:).*" docker-compose.yml)

.github/workflows/docker-push.yml

@@ -0,0 +1,34 @@
+name: Docker build of nginx-keycloak
+
+on:
+  push:
+    branches:
+      - main
+    paths:
+      - 'Dockerfile'
+
+jobs:
+
+  docker-build:
+    name: Ubuntu 22.04 build of nginx-keycloak
+    runs-on: ubuntu-22.04
+
+    steps:
+
+      - name: Check Out Repo 
+        uses: actions/checkout@v2
+
+      - name: Docker-compose build
+        run: |
+          docker compose build
+      
+      - name: Log in to GitHub Container Registry
+        uses: docker/login-action@v1
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Push nginx image to GitHub Container Registry
+        run: |
+          docker push ghcr.io/flavienbwk/nginx-keycloak/nginx-sso:$(grep -oP "(?<=image: ghcr.io/flavienbwk/nginx-keycloak/nginx-sso:).*" docker-compose.yml)