revert docker dependency cache

.github/workflows/xahau-sh-build-in-docker.yml

@@ -3,12 +3,8 @@ name: Release - SH Runner
 on:
   push:
     branches: ["dev", "candidate", "release"]
-  workflow_dispatch:
-    inputs:
-      reason:
-        description: 'Release Build'
-        required: false
-        default: 'Manual PR testing'
+  pull_request:
+    branches: ["dev", "candidate", "release"]
 
 concurrency:
   group: ${{ github.workflow }}-${{ github.ref }}
@@ -19,7 +15,6 @@ env:
 
 jobs:
   checkout:
-    if: github.event_name == 'push' || github.event_name == 'workflow_dispatch'
     runs-on: [self-hosted, vanity]
     outputs:
       checkout_path: ${{ steps.vars.outputs.checkout_path }}