Add ability to run workflow manually (#831)

* Add ability to run workflow manually

* Also add event to 'Generate env.PATH_PREFIX' step

Author: reakaleek

.github/workflows/preview-build.yml

@@ -55,7 +55,7 @@ jobs:
     steps:
 
       - name: Checkout
-        if:  contains(fromJSON('["push", "merge_group"]'), github.event_name)
+        if:  contains(fromJSON('["push", "merge_group", "workflow_dispatch"]'), github.event_name)
         uses: actions/checkout@v4
         with:
           ref: ${{ github.event.pull_request.head.sha || github.ref }}
@@ -80,7 +80,7 @@ jobs:
           tool-cache: false
 
       - name: Create Deployment
-        if: github.event_name == 'push' || (steps.check-files.outputs.any_modified == 'true' && startsWith(github.event_name, 'pull_request'))
+        if: contains(fromJSON('["push", "workflow_dispatch"]'), github.event_name) || (steps.check-files.outputs.any_modified == 'true' && startsWith(github.event_name, 'pull_request'))
         uses: actions/github-script@v7
         id: deployment
         env:
@@ -122,7 +122,7 @@ jobs:
             "merge_group" | "pull_request" | "pull_request_target")
               echo "PATH_PREFIX=/${GITHUB_REPOSITORY}/pull/${PR_NUMBER}" >> $GITHUB_ENV
               ;;
-            "push")
+            "push" | "workflow_dispatch")
               echo "PATH_PREFIX=/${GITHUB_REPOSITORY}/tree/${GITHUB_REF_NAME}" >> $GITHUB_ENV
               if [[ ! "${GITHUB_REF_NAME}" =~ ^(main|master|16\.x)$ ]]; then
                 echo "Unsupported ref name: '${GITHUB_REF_NAME}'";