Added many, many more actions.

utils/compare/action.yaml

@@ -0,0 +1,44 @@
+name: compare
+description: "Compare the output of a command to an expected value."
+inputs:
+  expected:
+    description: "Expected output."
+    required: false
+  actual:
+    description: "Actual output."
+    required: true
+  exitOnFail:
+    description: "Should the program exit on a failure."
+    required: true
+    default: "true"
+outputs:
+  success:
+    description: "The result of the comparison."
+    value: ${{ steps.compare.outputs.success }}
+runs:
+  using: "composite"
+  steps:
+  - name: "Compare input and output"
+    id: compare
+    run: |
+      EXPECTED=$(cat <<EOF
+      ${{ inputs.expected }}
+      EOF
+      )
+      ACTUAL=$(cat <<EOF
+      ${{ inputs.actual }}
+      EOF
+      )
+
+      if [[ "$EXPECTED" == "$ACTUAL" ]]; then
+        echo "success=true" >> "$GITHUB_OUTPUT"
+      else
+        echo "success=false" >> "$GITHUB_OUTPUT"
+        if [[ "${{ inputs.exitOnFail }}" == "true" ]]; then
+          echo EXPECTED: "$EXPECTED"
+          echo --------------------------------
+          echo ACTUAL: "$ACTUAL"
+          exit 1
+        fi
+      fi
+    shell: bash