Restructure Github actions

.github/workflows/run-pdk-tests-on-puppet-6.yml

@@ -0,0 +1,17 @@
+name: Run PDK tests on Puppet 6.x
+
+on:
+  - push
+  - pull_request
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+    - name: Clone repository
+      uses: actions/checkout@v2
+
+    - name: Run unit tests
+      uses: puppets-epic-show-theatre/action-pdk-test-unit@v1
+      with:
+        puppet-version: "6"

.github/workflows/run-pdk-tests-on-puppet-7.yml

@@ -0,0 +1,17 @@
+name: Run PDK tests on Puppet 7.x
+
+on:
+  - push
+  - pull_request
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+    - name: Clone repository
+      uses: actions/checkout@v2
+
+    - name: Run unit tests
+      uses: puppets-epic-show-theatre/action-pdk-test-unit@v1
+      with:
+        puppet-version: "7"

.github/workflows/run-pdk-validate.yml

@@ -0,0 +1,16 @@
+---
+name: Run PDK validate
+
+on:
+  - push
+  - pull_request
+
+jobs:
+  validate:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Clone repository
+        uses: actions/checkout@v2
+
+      - name: Run pdk validate
+        uses: puppets-epic-show-theatre/action-pdk-validate@v1