chore: simpler release_tag action (#530)

- no CHANGES check
- support dry-run mode

.github/workflows/rt.yml

@@ -3,13 +3,19 @@
 name: release_tag
 
 # Performed actions:
-# - [x] check that last commit is the CHANGES edit
 # - [x] infer the last RC version
 # - [x] run bumpver.py with the new version
 # - [x] push the commit and new tag
+# - [x] support dry-run mode
 
 on:
   workflow_dispatch: # on manual trigger
+    inputs:
+      dryrun:
+        description: "Whether to run the release in a dry-run mode"
+        default: true
+        required: true
+        type: boolean
 
 jobs:
   new-tag:
@@ -21,18 +27,6 @@ jobs:
     steps:
       - uses: actions/checkout@v3
 
-      - id: get-diff
-        uses: technote-space/get-diff-action@v6
-        with:
-          PATTERNS: |
-            ${{ env.CHANGES_FILE }}
-          SET_ENV_NAME_COUNT: true
-
-      - id: check-changes
-        run: |
-          echo "${{ steps.get-diff.outputs.count }}/${{ env.EXPECTED_DIFF_COUNT }} changes in ${{ env.CHANGES_FILE }}."
-          exit ${{ steps.get-diff.outputs.count == env.EXPECTED_DIFF_COUNT && 0 || 1 }}
-
       - id: get-version
         run: |
           LAST_VERSION=$(grep -m1 -E ' \([0-9]+-[0-9]+-[0-9]+\)$' ${CHANGE_FILE} | awk '{ print $1 }')
@@ -49,10 +43,12 @@ jobs:
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
         run: |
+          echo ${{ inputs.dryrun && '💡 Running in dry-run mode' || 'Preparing release...' }}
+
           CHANGE_FILE=${{ env.CHANGES_FILE }}
           LAST_VERSION=${{ steps.get-version.outputs.LAST_VERSION }}
           git config user.name github-actions
           git config user.email github-actions@github.com
 
-          python3 bin/bumpver.py -t "Automated release ${LAST_VERSION}" ${LAST_VERSION}
+          python3 bin/bumpver.py ${{ inputs.dryrun && '-n' || '' }} -t "Automated release ${LAST_VERSION}" ${LAST_VERSION}
           git push --follow-tags