ci: add CI for keyphrase-checker action

Author: FidelusAleksander

.github/workflows/_ci_action_keyphrase_checker.yml

@@ -0,0 +1,151 @@
+name: Keyphrase Checker Action CI
+
+on:
+  pull_request:
+    branches:
+      - main
+    paths:
+      - actions/keyphrase-checker/**
+
+permissions:
+  contents: read
+
+defaults:
+  run:
+    working-directory: actions/keyphrase-checker
+    shell: bash
+
+jobs:
+  check-dist:
+    name: Check dist/
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout
+        id: checkout
+        uses: actions/checkout@v4
+
+      - name: Setup Node.js
+        id: setup-node
+        uses: actions/setup-node@v4
+        with:
+          node-version: 20
+          cache: npm
+          cache-dependency-path: actions/keyphrase-checker/package-lock.json
+
+      - name: Install Dependencies
+        run: npm ci
+
+      - name: Build dist/ Directory
+        run: npm run all
+
+      # This will fail the workflow if the `dist/` directory is different than
+      # expected.
+      - name: Compare Directories
+        id: diff
+        run: |
+          if [ ! -d dist/ ]; then
+            echo "Expected dist/ directory does not exist.  See status below:"
+            ls -la ./
+            exit 1
+          fi
+          if [ "$(git diff --ignore-space-at-eol --text dist/ | wc -l)" -gt "0" ]; then
+            echo "Detected uncommitted changes after build. See status below:"
+            git diff --ignore-space-at-eol --text dist/
+            exit 1
+          fi
+
+      # If `dist/` was different than expected, upload the expected version as a
+      # workflow artifact.
+      - if: ${{ failure() && steps.diff.outcome == 'failure' }}
+        name: Upload Artifact
+        id: upload
+        uses: actions/upload-artifact@v4
+        with:
+          name: dist
+          path: actions/keyphrase-checker/dist/
+
+  run-ts-tests:
+    name: Run TS Tests
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout
+        id: checkout
+        uses: actions/checkout@v4
+
+      - name: Setup Node.js
+        id: setup-node
+        uses: actions/setup-node@v4
+        with:
+          node-version: 20
+          cache: npm
+          cache-dependency-path: actions/keyphrase-checker/package-lock.json
+
+      - name: Install Dependencies
+        run: npm ci
+
+      - name: Test
+        run: npm run test
+
+  positive-tests:
+    name: Positive Action Tests
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Test direct text (not case-sensitive)
+        id: test-direct-text
+        uses: ./actions/keyphrase-checker
+        with:
+          text: "Hey @PrOfEssortocat, I'm finished with my task"
+          keyphrase: "@professortocat"
+
+      - name: Test text file (not case-sensitive)
+        id: test-text-file
+        uses: ./actions/keyphrase-checker
+        with:
+          text-file: ./actions/keyphrase-checker/__tests__/test-mixed-case.md
+          keyphrase: "github"
+          minimum-occurences: "3"
+
+  negative-tests:
+    name: Negative Action Tests
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - name: Test direct text (case-sensitive)
+        id: test-direct-text
+        continue-on-error: true
+        uses: ./actions/keyphrase-checker
+        with:
+          text: "Hey @PrOfEssortocat, I'm finished with my task"
+          keyphrase: "@professortocat"
+          case-sensitive: true
+
+      - name: Check output for direct text test
+        run: |
+          if [[ "${{ steps.test-direct-text.outcome }}" != "failure" ]]; then
+            echo "Expected 0 occurrences but found ${{ steps.test-direct-text.outputs.occurences }}"
+            exit 1
+          fi
+
+      - name: Test text file (case-sensitive)
+        id: test-text-file
+        continue-on-error: true
+        uses: ./actions/keyphrase-checker
+        with:
+          text-file: ./actions/keyphrase-checker/__tests__/test-mixed-case.md
+          keyphrase: "github"
+          minimum-occurences: "3"
+          case-sensitive: true
+
+      - name: Check output for text file test
+        run: |
+          if [[ "${{ steps.test-text-file.outputs.outcome }}" != "failure" ]]; then
+            echo "Expected 1 occurrences but found ${{ steps.test-text-file.outputs.occurences }}"
+            exit 1
+          fi
+
+