Push Dockerhub README.md file on release

Add stage 'readme' and job 'readme_docker_release_tag' to push the file 'docker/README.md' to the team's duniter-v2s repo.

The job uses chko/docker-pushrm and is adapted from the related Gitlab CI/CD example.

See https://github.com/christian-korneck/docker-pushrm

.gitlab-ci.yml

@@ -5,6 +5,7 @@ stages:
   - build
   - tests
   - deploy
+  - deploy_readme
 
 workflow:
   rules:
@@ -209,9 +210,9 @@ tests_release:
   script:
     - docker pull $CI_REGISTRY_IMAGE:$IMAGE_TAG || true
     - docker build --cache-from $CI_REGISTRY_IMAGE:$IMAGE_TAG --pull -t "$CI_REGISTRY_IMAGE:$IMAGE_TAG" -f $DOCKERFILE_PATH .
-    - docker login -u "duniterteam" -p "$DUNITERTEAM_PASSWD"
-    - docker tag "$CI_REGISTRY_IMAGE:$IMAGE_TAG" "duniter/duniter-v2s:$IMAGE_TAG"
-    - docker push "duniter/duniter-v2s:$IMAGE_TAG"
+    - docker login -u "$REPO_DOCKER_USER" -p "$REPO_DOCKER_PASS"
+    - docker tag "$CI_REGISTRY_IMAGE:$IMAGE_TAG" "$REPO_DOCKER_REPO/duniter-v2s:$IMAGE_TAG"
+    - docker push "$REPO_DOCKER_REPO/duniter-v2s:$IMAGE_TAG"
 
 deploy_docker_test_image:
   extends: .docker-build-app-image
@@ -236,9 +237,9 @@ deploy_docker_debug_sha:
     DOCKERFILE_PATH: "docker/Dockerfile"
     IMAGE_TAG: "debug-sha-$CI_COMMIT_SHORT_SHA"
   after_script:
-    - docker login -u "duniterteam" -p "$DUNITERTEAM_PASSWD"
-    - docker tag "duniter/duniter-v2s:$IMAGE_TAG" "duniter/duniter-v2s:debug-latest"
-    - docker push "duniter/duniter-v2s:debug-latest"
+    - docker login -u "$REPO_DOCKER_USER" -p "$REPO_DOCKER_PASS"
+    - docker tag "$REPO_DOCKER_REPO/duniter-v2s:$IMAGE_TAG" "$REPO_DOCKER_REPO/duniter-v2s:debug-latest"
+    - docker push "$REPO_DOCKER_REPO/duniter-v2s:debug-latest"
 
 deploy_docker_release_sha:
   extends: .docker-build-app-image
@@ -250,6 +251,10 @@ deploy_docker_release_sha:
   variables:
     DOCKERFILE_PATH: "docker/Dockerfile"
     IMAGE_TAG: "sha-$CI_COMMIT_SHORT_SHA"
+  after_script:
+    - docker login -u "$REPO_DOCKER_USER" -p "$REPO_DOCKER_PASS"
+    - docker tag "$REPO_DOCKER_REPO/duniter-v2s:$IMAGE_TAG" "$REPO_DOCKER_REPO/duniter-v2s:sha-latest"
+    - docker push "$REPO_DOCKER_REPO/duniter-v2s:sha-latest"
   dependencies:
     - build_release_manual
 
@@ -262,8 +267,26 @@ deploy_docker_release_tag:
     DOCKERFILE_PATH: "docker/Dockerfile"
     IMAGE_TAG: "$CI_COMMIT_TAG"
   after_script:
-    - docker login -u "duniterteam" -p "$DUNITERTEAM_PASSWD"
-    - docker tag "duniter/duniter-v2s:$IMAGE_TAG" "duniter/duniter-v2s:latest"
-    - docker push "duniter/duniter-v2s:latest"
+    - docker login -u "$REPO_DOCKER_USER" -p "$REPO_DOCKER_PASS"
+    - docker tag "$REPO_DOCKER_REPO/duniter-v2s:$IMAGE_TAG" "$REPO_DOCKER_REPO/duniter-v2s:latest"
+    - docker push "$REPO_DOCKER_REPO/duniter-v2s:latest"
   dependencies:
     - build_release
+
+readme_docker_release_tag:
+  stage: deploy_readme
+  rules:
+    - if: "$CI_COMMIT_TAG && $CI_COMMIT_TAG =~ /^v*/"
+    - when: manual
+  image:
+    name: chko/docker-pushrm
+    entrypoint: ["/bin/sh", "-c", "/docker-pushrm"]
+  variables:
+    DOCKER_USER: "$REPO_DOCKER_USER"
+    DOCKER_PASS: "$REPO_DOCKER_PASS"
+    PUSHRM_SHORT: "Duniter v2 based on Substrate framework"
+    PUSHRM_TARGET: "docker.io/$REPO_DOCKER_REPO/duniter-v2s"
+    PUSHRM_DEBUG: 1
+    PUSHRM_FILE: "$CI_PROJECT_DIR/docker/README.md"
+  script: "/bin/true"
+