Added many, many more actions.

utils/compare-files/action.yaml

@@ -0,0 +1,49 @@
+name: compare-files
+description: "Compare the output of a command to an expected value."
+inputs:
+  expected:
+    description: "Expected output file."
+    required: true
+  expectedPattern:
+    description: "Optional pattern to match files in the expected directory."
+    required: false
+  actual:
+    description: "Actual output file."
+    required: true
+  actualPattern:
+    description: "Optional pattern to match files in the actual directory."
+    required: false
+  exitOnFail:
+    description: "Should the program exit on a failure."
+    required: true
+    default: "true"
+outputs:
+  success:
+    description: "The result of the comparison."
+    value: ${{ steps.compare.outputs.success }}
+runs:
+  using: "composite"
+  steps:
+  - name: "Read files."
+    id: read
+    run: |
+      LHS_NUSPEC=$(cat "${{ inputs.expected }}"${{ inputs.expectedPattern }})
+      RHS_NUSPEC=$(cat "${{ inputs.actual }}"${{ inputs.actualPattern }})
+
+      if [[ -n "$LHS_NUSPEC" ]]; then
+          echo "lhs<<EOF" >> "$GITHUB_OUTPUT"
+          echo "$LHS_NUSPEC" >> "$GITHUB_OUTPUT"
+          echo "EOF" >> "$GITHUB_OUTPUT"
+      fi
+      if [[ -n "$RHS_NUSPEC" ]]; then
+          echo "rhs<<EOF" >> "$GITHUB_OUTPUT"
+          echo "$RHS_NUSPEC" >> "$GITHUB_OUTPUT"
+          echo "EOF" >> "$GITHUB_OUTPUT"
+      fi
+    shell: bash
+  - name: "Build matrix from yaml."
+    uses: act/common/utils/compare@master
+    with:
+      expected: ${{ steps.read.outputs.lhs }}
+      actual: ${{ steps.read.outputs.rhs }}
+      exitOnFail: ${{ inputs.exitOnFail }}