ci: add experimental code that pushes docker images to DockerHub

Author: yutaro-sakamoto

.github/workflows/ci.yml

@@ -21,10 +21,23 @@ jobs:
 
       - name: Build a docker image
         run: |
-          docker build -t opensourcecobol/opensourcecobol4j:"$version_string_prefix" . \
+          docker build -t opensourcecobol/opensourcecobol4j:"$version_string_prefix"-debug . \
           --build-arg opensource_COBOL_4J_version="$opensource_COBOL_4J_version" \
           --build-arg Open_COBOL_ESQL_4J_version="$Open_COBOL_ESQL_4J_version"
 
+      - name: Login to Docker Hub
+        if: github.ref == 'refs/heads/y-sakamoto/auto-deploy' && github.event_name == 'push'
+        uses: docker/login-action@v3
+        with:
+          username: ${{ secrets.DOCKERHUB_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_TOKEN }}
+
+      - name: Push to Docker Hub
+        if: github.ref == 'refs/heads/y-sakamoto/auto-deploy' && github.event_name == 'push'
+        run: |
+          docker push opensourcecobol/opensourcecobol4j:"$version_string_prefix"-debug
+          docker push opensourcecobol/opensourcecobol4j:"$version_string_prefix"-debug-latest
+
   utf8-build:
     runs-on: ubuntu-latest
 
@@ -40,6 +53,18 @@ jobs:
 
       - name: Build a docker image
         run: |
-          docker build -t opensourcecobol/opensourcecobol4j:utf8-"$version_string_prefix" . \
+          docker build -t opensourcecobol/opensourcecobol4j:utf8-"$version_string_prefix"-debug . \
           --build-arg opensource_COBOL_4J_version="$opensource_COBOL_4J_version" \
           --build-arg Open_COBOL_ESQL_4J_version="$Open_COBOL_ESQL_4J_version"
+
+      - name: Login to Docker Hub
+        if: github.ref == 'refs/heads/y-sakamoto/auto-deploy' && github.event_name == 'push'
+        uses: docker/login-action@v3
+        with:
+          username: ${{ secrets.DOCKERHUB_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_TOKEN }}
+
+      - name: Push to Docker Hub
+        if: github.ref == 'refs/heads/y-sakamoto/auto-deploy' && github.event_name == 'push'
+        run: |
+          docker push opensourcecobol/opensourcecobol4j:utf8-"$version_string_prefix"-debug