Updated CI action for Docker image

.github/workflows/dockerimage.yml

@@ -5,17 +5,24 @@ on: [push]
 jobs:
   build:
     runs-on: ubuntu-latest
+    permissions:
+      packages: write
 
     steps:
-    - uses: actions/checkout@v1
+    - uses: actions/checkout@v4
 
     - name: Build the Docker image
       run: |
         docker build . --file Dockerfile --tag ghcr.io/eol-uchile/backup_container:${GITHUB_SHA}
 
+    - name: Login to Github Container Registry
+      uses: docker/login-action@v3
+      with:
+        registry: ghcr.io
+        username: ${{ github.actor }}
+        password: ${{ secrets.GITHUB_TOKEN }}
+
     - name: Push to Github Container Registry
+      if: github.ref == 'refs/heads/master'
       run: |
-          echo "${CR_PAT}" | docker login ghcr.io -u eolito --password-stdin
-          docker push ghcr.io/eol-uchile/backup_container:${GITHUB_SHA}
-      env:
-        CR_PAT: ${{ secrets.CR_PAT }}
+        docker push ghcr.io/eol-uchile/backup_container:${GITHUB_SHA}