[UPDATE] Change deploy server

Change deploying docker hub to deploying docker registry

.github/workflows/docker.yml

@@ -9,16 +9,21 @@ jobs:
     steps:
       - name: Check out the repo
         uses: actions/checkout@v2
+      - name: Set env
+        run: echo "RELEASE_VERSION=${GITHUB_REF#refs/*/v}" >> $GITHUB_ENV
       - name: Grant permission to gradlew
         run: chmod 755 gradlew
       - name: Build Gradle
         run: ./gradlew clean build --exclude-task test
-      - name: Push to Docker Hub
-        uses: docker/build-push-action@v2
+      - name: Login to GitHub Container Registry
+        uses: docker/login-action@v1
         with:
-          username: ${{ secrets.DOCKER_USERNAME }}
-          password: ${{ secrets.DOCKER_PASSWORD }}
-          repository: avocatpear/backend
-          file: ./Dockerfile
-          path: ./
-          tag_with_ref: true
+          registry: ghcr.io
+          username: ${{ github.repository_owner }}
+          password: ${{ secrets.CR_PAT }}
+      - name: Login to GitHub Container Registry
+        uses: docker/login-action@v1
+        with:
+          registry: ghcr.io
+          username: ${{ github.repository_owner }}
+          password: ${{ secrets.CR_PAT }}