Added many, many more actions.

utils/envsubst/.github/workflows/test.yaml

@@ -0,0 +1,25 @@
+#This is an example of a possible way to Unit Test a single action.
+name: "Run unit tests."
+on: workflow_call
+jobs:
+  run-tests:
+    runs-on: ubuntu-18.04
+    steps:
+    - uses: actions/checkout@v3
+    - name: "Run Test"
+      id: test
+      uses: ./.
+      env:
+        TEST_VAR: Hello, world!
+      with:
+        input: |
+          And I say:
+          "$TEST_VAR"
+    - name: "Verify output."
+      uses: act/common/utils/compare@master
+      with:
+        expected: |
+          And I say:
+          "Hello, world!"
+        actual: |
+          ${{ steps.test.outputs.result }}