chore: add workflow to semi-automate generating release notes

Signed-off-by: Josh <josh.t.richards@gmail.com>

.github/workflows/draft-release.yml

@@ -0,0 +1,93 @@
+name: Draft image release
+
+permissions:
+  contents: write
+
+on:
+  workflow_dispatch:
+    inputs:
+      official_images_pr:
+        description: Optional official-images PR number to use instead of auto-detect
+        required: false
+        type: string
+      release_tag:
+        description: Optional explicit release tag, for example v2026.06.1
+        required: false
+        type: string
+  #schedule:
+  #  - cron: "23 * * * *"
+
+concurrency:
+  group: draft-image-release
+  cancel-in-progress: false
+
+defaults:
+  run:
+    shell: bash -Eeuo pipefail {0}
+
+jobs:
+  draft-release:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Check out repository
+        uses: actions/checkout@v6
+        with:
+          fetch-depth: 0
+          ref: master
+
+      - name: Ensure origin/master is available
+        run: git fetch origin master
+
+      - name: Generate release draft payload
+        env:
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          REPO: ${{ github.repository }}
+          INPUT_OFFICIAL_IMAGES_PR: ${{ inputs.official_images_pr }}
+          INPUT_RELEASE_TAG: ${{ inputs.release_tag }}
+        run: .github/scripts/generate-release-draft.sh
+
+      - name: Create or update draft release
+        if: env.SKIP_RELEASE != 'true'
+        env:
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          REPO: ${{ github.repository }}
+        run: |
+          if gh release view "$RELEASE_TAG" --repo "$REPO" >/dev/null 2>&1; then
+            echo "Updating existing draft release $RELEASE_TAG"
+            gh release edit "$RELEASE_TAG" \
+              --repo "$REPO" \
+              --draft=true \
+              --title "$RELEASE_TAG" \
+              --notes-file "$RUNNER_TEMP/release-notes.md"
+          else
+            echo "Creating draft release $RELEASE_TAG targeting $TARGET_SHA"
+            gh release create "$RELEASE_TAG" \
+              --repo "$REPO" \
+              --draft \
+              --title "$RELEASE_TAG" \
+              --target "$TARGET_SHA" \
+              --notes-file "$RUNNER_TEMP/release-notes.md"
+          fi
+
+      - name: Workflow summary
+        if: env.SKIP_RELEASE != 'true'
+        run: |
+          {
+            echo "## Draft release prepared"
+            echo
+            echo "- Release tag: \`$RELEASE_TAG\`"
+            echo "- Target SHA: \`$TARGET_SHA\`"
+            echo "- Previous tag: \`$PREVIOUS_TAG\`"
+            echo "- Official Images PR: #$OFFICIAL_IMAGES_PR"
+            echo "- Official Images URL: $OFFICIAL_IMAGES_PR_URL"
+          } >> "$GITHUB_STEP_SUMMARY"
+
+      - name: Skip summary
+        if: env.SKIP_RELEASE == 'true'
+        run: |
+          {
+            echo "## No release drafted"
+            echo
+            echo "$SKIP_REASON"
+          } >> "$GITHUB_STEP_SUMMARY"