chore(releases): minor improvements to the release workflow (#2764)

Changes in this PR:
- Arbitrary refs are now allowed when triggering the release workflow
manually (ref must be on the main branch).
- Release summary is now displayed in the GH job output; makes for a
nicer experience when approving the release workflow.

Author: myftija

.github/workflows/release.yml

@@ -15,9 +15,9 @@ on:
           - release
           - prerelease
         default: "prerelease"
-      prerelease_ref:
-        description: "The ref (branch, tag, or SHA) to checkout and release from (prerelease only)"
-        required: false
+      ref:
+        description: "The ref (branch, tag, or SHA) to checkout and release from"
+        required: true
         type: string
       prerelease_tag:
         description: "The npm dist-tag for the prerelease (e.g., 'v4-prerelease')"
@@ -30,6 +30,21 @@ concurrency:
   cancel-in-progress: false
 
 jobs:
+  show-release-summary:
+    name: 📋 Release Summary
+    runs-on: ubuntu-latest
+    if: |
+      github.repository == 'triggerdotdev/trigger.dev' &&
+      github.event_name == 'pull_request' &&
+      github.event.pull_request.merged == true &&
+      github.event.pull_request.head.ref == 'changeset-release/main'
+    steps:
+      - name: Show release summary
+        env:
+          PR_BODY: ${{ github.event.pull_request.body }}
+        run: |
+          echo "$PR_BODY" | sed -n '/^# Releases/,$p' >> $GITHUB_STEP_SUMMARY
+
   release:
     name: 🚀 Release npm packages
     runs-on: ubuntu-latest
@@ -53,7 +68,15 @@ jobs:
         uses: actions/checkout@v4
         with:
           fetch-depth: 0
-          ref: main
+          ref: ${{ github.event_name == 'workflow_dispatch' && github.event.inputs.ref || github.sha }}
+
+      - name: Verify ref is on main
+        if: github.event_name == 'workflow_dispatch'
+        run: |
+          if ! git merge-base --is-ancestor ${{ github.event.inputs.ref }} origin/main; then
+            echo "Error: ref must be an ancestor of main (i.e., already merged)"
+            exit 1
+          fi
 
       - name: Setup pnpm
         uses: pnpm/action-setup@v4
@@ -121,14 +144,7 @@ jobs:
         uses: actions/checkout@v4
         with:
           fetch-depth: 0
-          ref: ${{ github.event.inputs.prerelease_ref }}
-
-      - name: Validate ref is on main
-        run: |
-          if ! git merge-base --is-ancestor ${{ github.event.inputs.prerelease_ref }} origin/main; then
-            echo "Error: ref must be an ancestor of main (i.e., already merged)"
-            exit 1
-          fi
+          ref: ${{ github.event.inputs.ref }}
 
       - name: Setup pnpm
         uses: pnpm/action-setup@v4