Tag by pull request number using the PR prefix

Signed-off-by: Ivan Kanakarakis <[email protected]>

Author: c00kiemon5ter

.travis.yml

@@ -44,6 +44,7 @@ jobs:
         DOCKER_REPO: $DOCKER_REPO
         DOCKER_TAG_COMMIT: $DOCKER_TAG_COMMIT
         DOCKER_TAG_BRANCH: $DOCKER_TAG_BRANCH
+        DOCKER_TAG_PR_NUM: $DOCKER_TAG_PR_NUM
         DOCKER_TAG_GITTAG: $DOCKER_TAG_GITTAG
         DOCKER_TAG_LATEST: $DOCKER_TAG_LATEST
         EOF
@@ -64,6 +65,15 @@ jobs:
         - docker login -u "$DOCKER_USERNAME" -p "$DOCKER_PASS"
         - docker push "$DOCKER_REPO"
 
+    - stage: Tag docker image with pull request number
+      if: type = pull_request
+      script:
+        - set -e
+        - docker pull "$DOCKER_TAG_COMMIT"
+        - docker tag "$DOCKER_TAG_COMMIT" "$DOCKER_TAG_PR_NUM"
+        - docker login -u "$DOCKER_USERNAME" -p "$DOCKER_PASS"
+        - docker push "$DOCKER_REPO"
+
     - stage: Tag docker image with git-tag
       if: tag IS present
       script:
@@ -113,5 +123,6 @@ env:
     - DOCKER_REPO: "satosa/satosa"
     - DOCKER_TAG_COMMIT: "${DOCKER_REPO}:${TRAVIS_COMMIT}"
     - DOCKER_TAG_BRANCH: "${DOCKER_REPO}:${TRAVIS_BRANCH}"
+    - DOCKER_TAG_PR_NUM: "${DOCKER_REPO}:PR${TRAVIS_PULL_REQUEST}"
     - DOCKER_TAG_GITTAG: "${DOCKER_REPO}:${TRAVIS_TAG:-NO_TAG}"
     - DOCKER_TAG_LATEST: "${DOCKER_REPO}:latest"