Adds basic workflow for pdk based modules

.github/workflows/pdk-basic.yml

@@ -0,0 +1,41 @@
+name: PDK basic
+
+on:
+  workflow_call:
+    inputs:
+      container_image:
+        description: Image to use when running tests
+        default: 'puppet/puppet-dev-tools:2022-04-21-e44b72b'
+        required: false
+        type: string
+
+jobs:
+  validate:
+    runs-on: ubuntu-latest
+    container: ${{ inputs.container_image }}
+    outputs:
+        puppet_unit_test_matrix: ${{ steps.get-outputs.outputs.puppet_unit_test_matrix }}
+        github_action_test_matrix: ${{ steps.get-outputs.outputs.github_action_test_matrix }}
+    steps:
+      - uses: actions/checkout@v2
+      - name: action-pdk-validate-puppet-7
+        run: pdk validate --puppet-version=7
+      - run: gem install puppet_metadata --no-document 
+      - name: Setup Test Matrix
+        id: get-outputs
+        run: metadata2gha --use-fqdn
+
+
+  unit-puppet:
+    needs: 
+      - validate
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        include: ${{fromJson(needs.validate.outputs.puppet_unit_test_matrix)}}
+    container: ${{ inputs.container_image }}
+    steps:
+      - uses: actions/checkout@v2
+      - name: action-pdk-test-unit-puppet-${{ matrix.puppet }}
+        run: pdk test unit --puppet-version=${{ matrix.puppet }}

README.md

@@ -214,3 +214,31 @@ jobs:
     uses: voxpupuli/gha-puppet/.github/workflows/beaker.yml@v1
     working-directory: ./site/profiles
 ```
+
+## Cloning private repos
+If your CI pipline will clone private repos via the .fixtures.yml or Puppetfile
+you will need to supply a ssh private key for the runner to use during the job.
+
+That ssh private key can be a machine user's ssh key, or github deploy key.  As long 
+as the key has access to the repos it will need to clone.
+
+You will need to create a github secret for the private key named `PRIVATE_SSH_KEY`
+
+An example CI workflow is below for this kind of setup.
+
+For reference: https://stackoverflow.com/questions/57612428/cloning-private-github-repository-within-organisation-in-actions
+
+
+```yaml
+name: CI
+
+on: pull_request
+
+jobs:
+  puppet:
+    - name: Setup deploy key
+    run: eval `ssh-agent -s` && ssh-add - <<< '${{ secrets.PRIVATE_SSH_KEY }}'
+    - name: Puppet
+    uses: voxpupuli/gha-puppet/.github/workflows/pdk-basic.yml@master
+
+```