push image to dockerhub if credentials are provided.

.github/actions/docker/action.yml

@@ -17,6 +17,12 @@ inputs:
   tag:
     description: 'Tag for the image'
     required: true
+  dockerhub_user:
+    description: 'Username on dockerhub for second deploy'
+    required: false
+  dockerhub_password:
+    description: 'Password for dockerhub registry.'
+    required: false
 runs:
   using: 'docker'
   image: 'Dockerfile'
@@ -26,3 +32,5 @@ runs:
     - ${{ inputs.password }}
     - ${{ inputs.event_name }}
     - ${{ inputs.tag }}
+    - ${{ inputs.dockerhub_user }}
+    - ${{ inputs.dockerhub_password }}

.github/actions/docker/entrypoint.sh

@@ -7,6 +7,8 @@ project=$(echo "$2" | cut -d'/' -f2)
 password=$3
 event_name=$4
 tag=$5
+dockerhub_user=$6
+dockerhub_password=$7
 
 echo "Log in to registry."
 echo $password | docker login -u ${username} --password-stdin docker.pkg.github.com || exit 1
@@ -16,7 +18,12 @@ docker build docker -t docker.pkg.github.com/${username}/${project}/${image}:${t
 
 if [ "$event_name" != "pull_request" ]; then
     echo "Pushing to registry."
-    docker push docker.pkg.github.com/${username}/${project}/${image}:${tag}
+    docker push docker.pkg.github.com/${username}/${project}/${image}:${tag} || exit 1
+    if [ "$dockerhub_user" != "" ]; then
+        echo $dockerhub_password | docker login -u ${dockerhub_user} --password-stdin || exit 1
+        docker tag docker.pkg.github.com/${username}/${project}/${image}:${tag} ${username}/${project}-${image}:${tag}
+        docker push ${username}/${project}-${image}:${tag} || exit 1
+    fi  
 else
     echo "Pull request: not pushing to registry."
 fi

.github/workflows/build.yml

@@ -23,3 +23,5 @@ jobs:
         password: ${{ secrets.GITHUB_TOKEN }}
         event_name: ${{ github.event_name }}
         tag: ${{ github.sha }}
+        dockerhub_user: ${{ secrets.DOCKERHUB_USERNAME }}
+        dockerhub_password: ${{ secrets.DOCKERHUB_TOKEN }}