feat: autoclean tmp container image on tag

templates/job/container/build.yml

@@ -30,6 +30,7 @@ container:purge:
   image:    buildpack-deps:buster-curl
   stage:    clean
   rules:
+    - if: $CI_COMMIT_TAG
     - if: $CI_COMMIT_BRANCH == $CI_DEFAULT_BRANCH
   variables:
     REG_SHA256: ade837fc5224acd8c34732bf54a94f579b47851cc6a7fd5899a98386b782e228
@@ -40,11 +41,21 @@ container:purge:
     - echo "$REG_SHA256  /usr/local/bin/reg" | sha256sum -c -
     - chmod a+x /usr/local/bin/reg
     - cd ${working_directory}
-  script: |  
-    if (echo ${CI_COMMIT_TITLE} |  grep "Merge branch '.*' into 'master'"); then
-      echo "It's a merge commit \o/"
+  script: |
+    clean_images=false
+
+    if [[ -n "${CI_COMMIT_TAG}" ]]; then
+      echo "It's a tag 🔖"
+      SOURCE_BRANCH=${CI_DEFAULT_BRANCH}
+      clean_images=true
+    elif (echo ${CI_COMMIT_TITLE} |  grep "Merge branch '.*' into 'master'"); then
+      echo "It's a merge 🔀"
       SOURCE_BRANCH=$(echo $CI_COMMIT_TITLE |  cut -d "'" -f 2)
-      echo "Source branch of the merge ${SOURCE_BRANCH}"
+      clean_images=true
+    fi
+
+    if [[ "${clean_images}" = true ]]; then
+      echo "Source branch to purge : ${SOURCE_BRANCH}"
 
       # Namespace
       container_namespace="${CI_PROJECT_PATH}/branch-${SOURCE_BRANCH//\//_}"