ci: workflow dispatch options (#29611)

diff --git a/.github/helper/install.sh b/.github/helper/install.sh
index 9031968..eab6d50 100644
--- a/.github/helper/install.sh
+++ b/.github/helper/install.sh
@@ -8,7 +8,10 @@
 
 pip install frappe-bench
 
-git clone https://github.com/frappe/frappe --branch "${GITHUB_BASE_REF:-${GITHUB_REF##*/}}" --depth 1
+frappeuser=${FRAPPE_USER:-"frappe"}
+frappebranch=${FRAPPE_BRANCH:-${GITHUB_BASE_REF:-${GITHUB_REF##*/}}}
+
+git clone "https://github.com/${frappeuser}/frappe" --branch "${frappebranch}" --depth 1
 bench init --skip-assets --frappe-path ~/frappe --python "$(which python)" frappe-bench
 
 mkdir ~/frappe-bench/sites/test_site
diff --git a/.github/workflows/server-tests-mariadb.yml b/.github/workflows/server-tests-mariadb.yml
index 7347a58..40f9365 100644
--- a/.github/workflows/server-tests-mariadb.yml
+++ b/.github/workflows/server-tests-mariadb.yml
@@ -6,12 +6,23 @@
       - '**.js'
       - '**.md'
       - '**.html'
-  workflow_dispatch:
   push:
     branches: [ develop ]
     paths-ignore:
       - '**.js'
       - '**.md'
+  workflow_dispatch:
+    inputs:
+      user:
+        description: 'user'
+        required: true
+        default: 'frappe'
+        type: string
+      branch:
+        description: 'Branch name'
+        default: 'develop'
+        required: false
+        type: string
 
 concurrency:
   group: server-mariadb-develop-${{ github.event.number }}
@@ -95,6 +106,8 @@
         env:
           DB: mariadb
           TYPE: server
+          FRAPPE_USER: ${{ github.event.inputs.user }}
+          FRAPPE_BRANCH: ${{ github.event.inputs.branch }}
 
       - name: Run Tests
         run: cd ~/frappe-bench/ && bench --site test_site run-parallel-tests --app erpnext --use-orchestrator --with-coverage