Added "dynamic uses" action

To the repository root so it can be referenced and used in
Github workflows. The action is originally from [1].

Contains failing CI.

[1] https://github.com/jenseng/dynamic-uses

Author: webwarrior-ws

action.yml

@@ -0,0 +1,43 @@
+name: Dynamic Uses
+description: Dynamically resolve and use another GitHub action. Workaround for https://github.com/actions/runner/issues/895
+author: Jon Jensen
+inputs:
+  uses:
+    description: Action reference or path, e.g. `actions/setup-node@v3`
+    required: true
+  with:
+    description: 'JSON-ified `inputs` for the action, e.g. `{"node-version": "18"}`'
+    required: false
+    default: "{}"
+outputs:
+  outputs:
+    description: 'JSON-ified `outputs` from the action, e.g. `{"node-version": "v18.12.0", "cache-hit": true}`'
+    value: ${{ steps.run.outputs.outputs }}
+runs:
+  using: composite
+  steps:
+    - name: Setup
+      shell: bash
+      run: |
+        mkdir -p ./.tmp-dynamic-uses &&
+        cat <<'DYNAMIC_USES_EOF' >./.tmp-dynamic-uses/action.yml
+        outputs:
+          outputs:
+            value: ${{ '$' }}{{ toJSON(steps.run.outputs) }}
+        runs:
+          using: composite
+          steps:
+          - run: rm -rf ./.tmp-dynamic-uses
+            shell: bash
+          - name: Run
+            id: run
+            uses: ${{ inputs.uses }}
+            with: ${{ inputs.with || '{}' }}
+        DYNAMIC_USES_EOF
+    - name: Run
+      id: run
+      uses: ./.tmp-dynamic-uses
+    - name: Cleanup
+      if: always() && steps.run.outcome != 'success'
+      shell: bash
+      run: rm -rf ./.tmp-dynamic-uses