Improve comment tags for PR comments

Author: bindreams

.github/actions/ensure-no-diff/action.yaml

@@ -1,10 +1,12 @@
 name: Ensure no changes to tracked files
 description: Detect any changes to tracked files and fail the forkflow.
 inputs:
-  post-pr-comment:
-    description: Post a comment with changes (only on pull requests)
+  pr-comment-tag:
+    description: |
+      If specified, post a comment with changes (only on pull requests).
+      Comments matching this tag will be edited or deleted on subsequent runs.
     required: false
-    default: true
+    default: ""
   comment-header:
     description: Header for the PR comment
     required: false
@@ -23,14 +25,15 @@ runs:
         shell: bash
         run: git diff --diff-algorithm=histogram --exit-code
 
-    - name: Post PR comment
+    - name: Update PR comment
       if: >-
         failure() &&
+        steps.git-diff.conclusion == 'failure' &&
         github.event_name == 'pull_request' &&
-        inputs.post-pr-comment == 'true'
+        inputs.pr-comment-tag != ''
       uses: thollander/actions-comment-pull-request@v3
       with:
-        comment-tag: ${{ github.job }}
+        comment-tag: ${{ inputs.comment-tag }}
         mode: recreate
         message: |
           ${{ inputs.comment-header }}

.github/workflows/build.yaml

@@ -17,7 +17,9 @@ jobs:
     steps:
       - uses: actions/checkout@v5
         with:
-          fetch-tags: true  # Required for dynamic version
+          # Required for dynamic version
+          fetch-depth: 0
+          fetch-tags: true
 
       - uses: actions/setup-python@v6
         with:
@@ -41,6 +43,8 @@ jobs:
 
       - name: Ensure no changes to tracked files
         uses: ./.github/actions/ensure-no-diff
+        with:
+          pr-comment-tag: ${{ github.job }}
 
   wheels:
     name: Binary wheels
@@ -57,7 +61,9 @@ jobs:
     steps:
       - uses: actions/checkout@v5
         with:
-          fetch-tags: true  # Required for dynamic version
+          # Required for dynamic version
+          fetch-depth: 0
+          fetch-tags: true
 
       - uses: actions/setup-python@v6
         with:
@@ -88,3 +94,5 @@ jobs:
 
       - name: Ensure no changes to tracked files
         uses: ./.github/actions/ensure-no-diff
+        with:
+          pr-comment-tag: ${{ github.job }}/${{matrix.os}}