Automatically deploy from any branch, PR comments on deploy (#638)

## Description:

- Automatically deploy from any branch
- Add a PR comment on deployment


![image](https://github.com/user-attachments/assets/895560de-b4b0-4b2a-90fd-e3d1818f3090)

## Please complete the following:

- [x] I have added screenshots for all UI updates
- [x] I confirm I have thoroughly tested these changes and take full
responsibility for any bugs introduced
- [x] I understand that submitting code with bugs that could have been
caught through manual testing blocks releases and new features for all
contributors

---------

Co-authored-by: Scott Anderson <662325+scottanderson@users.noreply.github.com>

.github/workflows/deploy.yml

@@ -28,10 +28,11 @@ on:
         default: ""
         type: string
 
-  #  Automatic deployment when pushing to main
+  # Automatic deployment on push
+  # See https://docs.github.com/en/actions/writing-workflows/workflow-syntax-for-github-actions#onpushpull_requestpull_request_targetpathspaths-ignore
   push:
     branches:
-      - main
+      - "*"
 
 jobs:
   deploy:
@@ -41,13 +42,16 @@ jobs:
     name: Deploy to ${{ inputs.target_subdomain && format('{0}.{1}', inputs.target_subdomain, inputs.target_domain) || inputs.target_domain || 'openfront.dev' }}
     runs-on: ubuntu-latest
     environment: ${{ inputs.target_subdomain && format('{0}.{1}', inputs.target_subdomain, inputs.target_domain) || inputs.target_domain || 'openfront.dev' }}
-
+    env:
+      DOMAIN: ${{ inputs.target_domain || 'openfront.dev' }}
+      SUBDOMAIN: ${{ github.event_name == 'push' && github.ref_name || inputs.target_subdomain || 'main' }}
     steps:
       - uses: actions/checkout@v4
       - name: Update deployment status
         env:
-          FQDN: ${{ inputs.target_subdomain && format('{0}.{1}', inputs.target_subdomain, inputs.target_domain) || inputs.target_domain || 'openfront.dev' }}
+          FQDN: ${{ env.SUBDOMAIN && format('{0}.{1}', env.SUBDOMAIN, env.DOMAIN) || env.DOMAIN || 'openfront.dev' }}
         run: |
+          echo "FQDN=$FQDN" >> $GITHUB_ENV
           cat <<EOF >> $GITHUB_STEP_SUMMARY
           ### In progress :ship:
 
@@ -79,14 +83,13 @@ jobs:
           CF_API_TOKEN: ${{ secrets.CF_API_TOKEN }}
           DOCKER_REPO: ${{ vars.DOCKERHUB_REPO }}
           DOCKER_USERNAME: ${{ vars.DOCKERHUB_USERNAME }}
-          DOMAIN: ${{ inputs.target_domain || 'openfront.dev' }}
           ENV: ${{ inputs.target_domain == 'openfront.io' && 'prod' || 'staging' }}
           HOST: ${{ github.event_name == 'workflow_dispatch' && inputs.target_host || 'staging' }}
           MON_PASSWORD: ${{ secrets.MON_PASSWORD }}
           MON_USERNAME: ${{ secrets.MON_USERNAME }}
           OTEL_ENDPOINT: ${{ secrets.OTEL_ENDPOINT }}
-          OTEL_USERNAME: ${{ secrets.OTEL_USERNAME }}
           OTEL_PASSWORD: ${{ secrets.OTEL_PASSWORD }}
+          OTEL_USERNAME: ${{ secrets.OTEL_USERNAME }}
           R2_ACCESS_KEY: ${{ secrets.R2_ACCESS_KEY }}
           R2_BUCKET: ${{ secrets.R2_BUCKET }}
           R2_SECRET_KEY: ${{ secrets.R2_SECRET_KEY }}
@@ -94,7 +97,6 @@ jobs:
           SERVER_HOST_STAGING: ${{ secrets.SERVER_HOST_STAGING }}
           SERVER_HOST_US: ${{ secrets.SERVER_HOST_US }}
           SSH_KEY: ~/.ssh/id_rsa
-          SUBDOMAIN: ${{ inputs.target_subdomain || 'main' }}
           VERSION_TAG: latest
         run: |
           echo "::group::deploy.sh"
@@ -102,18 +104,29 @@ jobs:
           echo "::endgroup::"
       - name: Update deployment status ✅
         if: success()
-        env:
-          FQDN: ${{ inputs.target_subdomain && format('{0}.{1}', inputs.target_subdomain, inputs.target_domain) || inputs.target_domain || 'openfront.dev' }}
         run: |
           cat <<EOF >> $GITHUB_STEP_SUMMARY
           ### Success! :rocket:
 
           Deployed from $GITHUB_REF to $FQDN
           EOF
+
+      - name: Notify PR 🚀
+        if: ${{ success() && github.event_name == 'push' }}
+        run: |
+          set -euxo pipefail
+
+          echo "Checking for open PR from $GITHUB_HEAD_REF..."
+          pr_url=$(gh pr list --head "$GITHUB_HEAD_REF" --state open --json url -q '.[0].url')
+          if [ -z "$pr_url" ]; then
+            echo "No open PR found for branch $GITHUB_HEAD_REF"
+            exit 0;
+          fi
+
+          gh pr comment "$pr_url" --body "🚀 Deployed ${GITHUB_SHA} to [$FQDN](https://$FQDN)."
+
       - name: Update deployment status ❌
         if: failure()
-        env:
-          FQDN: ${{ inputs.target_subdomain && format('{0}.{1}', inputs.target_subdomain, inputs.target_domain) || inputs.target_domain || 'openfront.dev' }}
         run: |
           cat <<EOF >> $GITHUB_STEP_SUMMARY
           ### Failure! :fire: