Filters input accepts path to external yaml file (#8)

* Filters input accepts path to external yaml file

* Fix formatting and eslint issues

* Fix file ext of filters yaml file

* Update documentation in README file

.github/filters.yml

@@ -0,0 +1,2 @@
+any:
+  - "**/*"

.github/workflows/pull-request-verification.yml

@@ -22,6 +22,10 @@ jobs:
     - uses: actions/checkout@v2
     - uses: ./
       id: filter
+      with:
+        filters: '.github/filters.yml'
+    - uses: ./
+      id: inlineFilter
       with:
         filters: |
           src:
@@ -31,5 +35,5 @@ jobs:
           any:
             - "**/*"
     - name: filter-test
-      if: steps.filter.outputs.any != 'true'
+      if: steps.filter.outputs.any != 'true' || steps.inlineFilter.outputs.any != 'true'
       run: exit 1