Add Docker images SNAPSHOT on Docker HUB (nightly)

[jbonofre]

As discussed on the mailing list, this PR extends nightly build to push SNAPSHOT images on Docker HUB.

[adutra]

@jbonofre thanks for driving this, it will be very useful!

Global suggestion: I would change the image names and tags in order to not mix up release images with nightly images:

      - name: Build Server Docker image
        run: |
          ./gradlew \
            :polaris-quarkus-server:assemble \
            :polaris-quarkus-server:quarkusAppPartsBuild --rerun \
            -Dquarkus.container-image.build=true \
            -Dquarkus.container-image.push=true \
            -Dquarkus.container-image.name=polaris-nightly \
            -Dquarkus.container-image.tag=$(date +%Y%m%d) \
            -Dquarkus.container-image.additional-tags=""
      - name: Build Admin Tool Docker image
        run: |
          ./gradlew \
            :polaris-quarkus-admin:assemble \
            :polaris-quarkus-admin:quarkusAppPartsBuild --rerun \
            -Dquarkus.container-image.build=true \
            -Dquarkus.container-image.push=true \
            -Dquarkus.container-image.name=polaris-admin-tool-nightly \
            -Dquarkus.container-image.tag=$(date +%Y%m%d) \
            -Dquarkus.container-image.additional-tags=""

[adutra]

Dangling \ here

[adutra]

This is only pushing the server image, not the admin tool image.

[jbonofre]

@adutra Thanks for the suggestion. I was planning to push only the server image, but it makes sense to push both. Then, it makes sense to use different docker image name. I will update this PR accordingly. Thanks !

[jbonofre]

@adutra I'm not sure using nightly in the image name is good there. I would prefer in the version/tag. Thoughts ?

[adutra]

I'm fine either way, as long as you don't use latest for that.

[jbonofre]

By the way, in apache DockerHub scope, we can only have polaris as image name for now. We can ask to create another apache/polaris-admin-tool repo. However, I think it's fine to use tag/version like admin-tool-xxxx. It's what I'm doing for the release for now.
OK ?

[adutra]

Hmm not really :-) we shouldn't mix different binaries under the same image name.

[jbonofre]

OK, so for now let's push only server image (polaris). Do you want me to already create apache/polaris-admin-tool repo ?

[adutra]

I'm fine with pushing just the server for now. If the process to create apache/polaris-admin-tool takes time, I'd say let's start it asap.

[jbonofre]

Let's start a discussion on the dev mailing list.