Add validate-inputs action

.github/workflows/_test-validate-inputs.yml

@@ -0,0 +1,42 @@
+---
+name: Test validate-inputs action sub-workflow
+
+on:
+  workflow_call:
+    inputs:
+      number:
+        description: A number
+        required: true
+        type: string
+      alphanumeric-string:
+        description: An alphanumeric string
+        required: true
+        type: string
+      fruit:
+        description: A fruit
+        required: true
+        type: string
+
+concurrency:
+  group: ${{ github.ref }}-${{ github.workflow }}
+  cancel-in-progress: true
+
+jobs:
+  main:
+    name: Test validate-inputs action
+    runs-on: ubuntu-20.04
+    steps:
+      - name: Checkout repo
+        uses: actions/checkout@v4
+
+      - name: Validate inputs
+        uses: ./validate-inputs
+        with:
+          names: |-
+            number
+            alphanumeric-string
+            fruit
+          regexps: |-
+            [0-9]+
+            [a-z0-9]+
+            apple|banana|lichi

.github/workflows/test-validate-inputs.yml

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+---
+name: Test validate-inputs action
+
+on:
+  pull_request:
+    branches:
+      - main
+  push:
+    branches:
+      - main
+
+concurrency:
+  group: ${{ github.ref }}-${{ github.workflow }}
+  cancel-in-progress: true
+
+jobs:
+  main:
+    name: Test validate-inputs action
+    runs-on: ubuntu-20.04
+    steps:
+      - name: Checkout repo
+        uses: actions/checkout@v4
+
+      - name: Call sub-workflow with valid inputs
+        uses: ./.github/workflows/_test-validate-inputs.yml
+        with:
+          number: 44
+          alphanumeric: abc123
+          fruit: lichi
+
+      - name: Call sub-workflow with invalid inputs
+        uses: ./.github/workflows/_test-validate-inputs.yml
+        id: should-fail
+        continue-on-error: true
+        with:
+          number: a
+          alphanumeric: 34-a
+          fruit: lemon
+
+      - name: Check failure
+        shell: bash
+        run: |
+          if [[ "${{ steps.should-fail.outcome }}" == "success" ]]; then
+            echo "!!! Failure test failed.  Something fishy is going on here"
+            exit 1
+          fi

validate-inputs/action.yml

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+---
+name: Validate inputs
+description: This action validates inputs
+inputs:
+  names:
+    description: Names of inputs to be checked against regular expression. One per line
+    required: true
+  regexps:
+    description: Regular expressions to check against. One per line
+    required: true
+runs:
+  using: 'node20'
+  main: 'dist/index.js'