ci: include changelogs in js update pr

Author: mandarini

.github/workflows/update-supabase-js.yml

@@ -47,6 +47,33 @@ jobs:
           npm pkg set "dependencies.@supabase/supabase-js=${{ inputs.version }}"
           pnpm install --lockfile-only --ignore-scripts
 
+      - name: Fetch release notes
+        env:
+          VERSION: ${{ inputs.version }}
+          GH_TOKEN: ${{ github.token }}
+        run: |
+          CURRENT_FULL=$(git show HEAD:website/package.json | jq -r '.dependencies["@supabase/supabase-js"] // ""' | grep -oP '[\d]+\.[\d]+\.[\d]+(-[\w.]+)?')
+          CURRENT_BASE=$(echo "$CURRENT_FULL" | grep -oP '[\d]+\.[\d]+\.[\d]+')
+          [[ "$CURRENT_FULL" == *"-"* ]] && INCLUDE_CURRENT=true || INCLUDE_CURRENT=false
+          [[ "$VERSION" == *"-"* ]] && STABLE_ONLY=false || STABLE_ONLY=true
+          RELEASES=$(gh api "repos/supabase/supabase-js/releases?per_page=100")
+          RELEASE_NOTES=$(echo "$RELEASES" | jq -r \
+            --arg current "v${CURRENT_BASE}" \
+            --arg new "v${VERSION}" \
+            --argjson stable_only "$STABLE_ONLY" \
+            --argjson include_current "$INCLUDE_CURRENT" \
+            '[.[] | select(.draft == false) | select(if $stable_only then .prerelease == false else true end)] |
+             (map(.tag_name) | index($new)) as $start |
+             (map(.tag_name) | index($current)) as $end |
+             ($end | if . != null and $include_current then . + 1 else . end) as $end_adj |
+             if $start == null then ["Target version not found in last 100 releases."]
+             elif $end_adj != null and $start >= $end_adj then ["Downgrade — no release notes available."]
+             else [.[$start:$end_adj][] | "## " + .tag_name + "\n\n" + (.body // "No release notes.")]
+             end | .[]')
+          echo "RELEASE_NOTES<<EOF" >> "$GITHUB_ENV"
+          echo "$RELEASE_NOTES" >> "$GITHUB_ENV"
+          echo "EOF" >> "$GITHUB_ENV"
+
       - name: Generate token
         id: app-token
         uses: actions/create-github-app-token@f8d387b68d61c58ab83c6c016672934102569859 # v3.0.0
@@ -65,6 +92,12 @@ jobs:
 
             **Source**: ${{ inputs.source }}
 
+            ---
+
+            ## Release Notes
+
+            ${{ env.RELEASE_NOTES }}
+
             This PR was created automatically.
           branch: "gha/auto-update-supabase-js-v${{ inputs.version }}"
           base: ${{ github.event.repository.default_branch }}