add filters to build workflow

Author: LongLiveCHIEF

.github/deploy_rules.yml renamed to .github/filters.yml

@@ -9,8 +9,22 @@ on:
       - master
 
 jobs:
+  filters:
+    runs-on: ubuntu-latest
+    outputs:
+      found_main_changes: ${{ steps.filter.outputs.main_image_files }}
+      found_minimal_changes: ${{ steps.filter.outputs.minimal_image_files }}
+    steps:
+    - uses: actions/checkout@v2
+    - uses: dorny/[email protected]
+      id: filter
+      with:
+        filters: '.github/filter.yml'
+
   build:
     runs-on: ubuntu-latest
+    needs: filters
+    if: needs.filters.outputs.found_main_changes
 
     steps:
       - uses: actions/checkout@v2

.github/workflows/build.yml

@@ -11,23 +11,23 @@ on:
 jobs:
   # This job ensures image is only deployed when files that make up the image are changed
   # (changing docs or build scripts won't result in a push to registry)
-  changes:
+  filters:
     runs-on: ubuntu-latest
     outputs:
-      deploy_main: ${{ steps.filter.outputs.main_image_files }}
-      deploy_minimal: ${{ steps.filter.outputs.minimal_image_files }}
+      found_main_image_changes: ${{ steps.filter.outputs.main_image_files }}
+      found_minimal_image_changes: ${{ steps.filter.outputs.minimal_image_files }}
     steps:
     - uses: actions/checkout@v2
     - uses: dorny/[email protected]
       if: ${{ github.event_name == 'push'}}
       id: filter
       with:
-        filters: '.github/deploy_rules.yml'
+        filters: '.github/filters.yml'
 
   release:
     runs-on: ubuntu-latest
-    needs: changes
-    if: github.event_name == 'repository_dispatch' || needs.changes.outputs.deploy == 'true'
+    needs: filters
+    if: github.event_name == 'repository_dispatch' || needs.filters.outputs.found_main_changes == 'true'
     strategy:
       matrix:
         tags: ['latest','%X%', '%X.Y%', '%X.Y.Z%']