release: check for both tag and release

.github/workflows/release.yaml

@@ -22,29 +22,39 @@ jobs:
 
       - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
 
-      - name: Check if any changes since last tag
+      - name: Check if any changes since last release
         id: check
+        env:
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
         run: |
           git fetch --tags
-          if [ -z "$(git tag --points-at HEAD)" ]; then
-            echo "Nothing points at HEAD, so we need a new tag+release."
+          TAG=$(git tag --points-at HEAD)
+          if [ -z "$TAG" ]; then
+            echo "No tag points at HEAD, so we need a new tag and then a new release."
             echo "need_release=yes" >> $GITHUB_OUTPUT
           else
-            echo "A tag already points to head, no need for a new tag+release."
-            echo "need_release=no" >> $GITHUB_OUTPUT
+            RELEASE=$(gh release view "$TAG" --json tagName --jq '.tagName' || echo "none")
+            if [ "$RELEASE" == "$TAG" ]; then
+              echo "A release exists for tag $TAG, which has the latest changes, so no need for a new tag or release."
+              echo "need_release=no" >> $GITHUB_OUTPUT
+            else
+              echo "Tag $TAG exists, but no release is associated. Need a new release."
+              echo "need_release=yes" >> $GITHUB_OUTPUT
+              echo "existing_tag=$TAG" >> $GITHUB_OUTPUT
+            fi
           fi
 
       - name: Bump version and push tag
         id: create_tag
         uses: mathieudutour/github-tag-action@a22cf08638b34d5badda920f9daf6e72c477b07b # v6.2
-        if: steps.check.outputs.need_release == 'yes'
+        if: steps.check.outputs.need_release == 'yes' && steps.check.outputs.existing_tag == ''
         with:
           github_token: ${{ secrets.GITHUB_TOKEN }}
 
       - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
         if: steps.check.outputs.need_release == 'yes'
         with:
-          ref: ${{ steps.create_tag.outputs.new_tag }}
+          ref: ${{ steps.check.outputs.existing_tag || steps.create_tag.outputs.new_tag }}
 
       - uses: actions/setup-go@41dfa10bad2bb2ae585af6ee5bb4d7d973ad74ed # v5.1.0
         if: steps.check.outputs.need_release == 'yes'
@@ -76,3 +86,4 @@ jobs:
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
           HOMEBREW_TAP_GITHUB_TOKEN: ${{ steps.octo-sts.outputs.token }}
+          TAG: ${{ steps.check.outputs.existing_tag || steps.create_tag.outputs.new_tag }}