test: changeset label action

.changeset/arpit-bruno-patch-1-test.md

@@ -0,0 +1,5 @@
+---
+"@opencollection/docs": minor
+---
+
+test: changeset label action (#1)

.github/workflows/changeset.yml

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+name: Changeset
+
+on:
+  pull_request:
+    types: [labeled]
+
+jobs:
+  changeset:
+    if: startsWith(github.event.label.name, 'changeset:')
+    runs-on: ubuntu-latest
+    permissions:
+      contents: write
+
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          ref: ${{ github.event.pull_request.head.ref }}
+          repository: ${{ github.event.pull_request.head.repo.full_name }}
+
+      - name: Write the changeset
+        env:
+          LABEL: ${{ github.event.label.name }}
+          TITLE: ${{ github.event.pull_request.title }}
+          BRANCH: ${{ github.event.pull_request.head.ref }}
+          NUMBER: ${{ github.event.pull_request.number }}
+        run: |
+          bump="${LABEL#changeset:}"
+          slug=$(printf '%s' "$BRANCH" \
+            | tr '[:upper:]' '[:lower:]' \
+            | sed -e 's#[^a-z0-9]#-#g' -e 's#--*#-#g' -e 's#^-##' -e 's#-$##')
+
+          mkdir -p .changeset
+          printf -- '---\n"@opencollection/docs": %s\n---\n\n%s (#%s)\n' \
+            "$bump" "$TITLE" "$NUMBER" > ".changeset/${slug}.md"
+
+          cat ".changeset/${slug}.md"
+
+      - name: Commit it to the PR branch
+        env:
+          ACTOR: ${{ github.actor }}
+          ACTOR_ID: ${{ github.actor_id }}
+        run: |
+          git config user.name  "$ACTOR"
+          git config user.email "${ACTOR_ID}+${ACTOR}@users.noreply.github.com"
+          git add .changeset
+          if git diff --cached --quiet; then
+            echo "changeset unchanged, nothing to commit"
+            exit 0
+          fi
+          git commit -m "chore: add changeset"
+          git push
+