implemented reusable github action

.github/workflows/tests.yml

@@ -1,19 +1,15 @@
 name: tests
-
 on: push
 
 jobs:
   build:
     runs-on: ubuntu-latest
-
     steps:
       - name: Checkout repository
         uses: actions/checkout@v1
         with:
           submodules: recursive
-      - name: Install dependencies
-        run: |
-          sudo apt-get update
-          sudo apt-get install -y binfmt-support file kpartx parted qemu qemu-user-static unzip p7zip-full wget xz-utils
-      - name: Run pimod.sh examples/RPi-OpenWRT.Pifile
-        run: sudo ./pimod.sh examples/RPi-OpenWRT.Pifile
+      - name: Run pimod OpenWRT example
+        uses: jonashoechst/pimod@HEAD
+        with:
+          pifile: examples/RPi-OpenWRT.Pifile

action.yml

@@ -0,0 +1,16 @@
+name: 'pimod'
+description: 'Reconfigure Raspberry Pi images with an easy, Docker-like configuration file'
+inputs:
+  pifile:
+    description: 'Pifile to run'
+    required: true
+    default: 'Pifile'
+runs:
+  using: "composite"
+  steps: 
+    - run: sudo apt-get update
+      shell: bash
+    - run: sudo apt-get install -y binfmt-support file kpartx parted qemu qemu-user-static unzip p7zip-full wget xz-utils
+      shell: bash
+    - run: sudo ${{ github.action_path }}/pimod.sh ${{ inputs.pifile }}
+      shell: bash