ci: consolidate "install dependencies" into an action

Author: petebacondarwin

.github/actions/install-dependencies/action.yml

@@ -0,0 +1,25 @@
+name: "Install Dependencies"
+description: "Install dependencies, fetching from cache when possible"
+inputs:
+  node-version:
+    description: the version of Node.js to install
+    default: 20.18.0
+
+runs:
+  using: "composite"
+  steps:
+    - name: Install pnpm
+      uses: pnpm/action-setup@v4
+      with:
+        version: 9
+
+    - name: Install Node.js ${{ inputs.node-version }}
+      uses: actions/setup-node@v4
+      with:
+        node-version: ${{ inputs.node-version }}
+        cache: "pnpm"
+        registry-url: "https://registry.npmjs.org"
+
+    - name: Install NPM Dependencies
+      shell: bash
+      run: pnpm install --frozen-lockfile

.github/workflows/checks.yml

@@ -18,19 +18,8 @@ jobs:
       - name: Check out code
         uses: actions/checkout@v4
 
-      - name: Setup pnpm
-        uses: pnpm/action-setup@v4
-        with:
-          version: 9
-
-      - name: Setup Node.js environment
-        uses: actions/setup-node@v4
-        with:
-          node-version: 20
-          cache: "pnpm"
-
-      - name: Install dependencies
-        run: pnpm install --frozen-lockfile
+      - name: Install Dependencies
+        uses: ./.github/actions/install-dependencies
 
       - name: ${{ matrix.script }}
         run: pnpm run ${{ matrix.script }}

.github/workflows/playwright.yml

@@ -14,21 +14,11 @@ jobs:
       - name: Check out code
         uses: actions/checkout@v4
 
-      - name: Setup pnpm
-        uses: pnpm/action-setup@v4
-        with:
-          version: 9
+      - name: Install Dependencies
+        uses: ./.github/actions/install-dependencies
 
-      - name: Setup Node.js environment
-        uses: actions/setup-node@v4
-        with:
-          node-version: 20
-          cache: "pnpm"
-
-      - name: Install dependencies
-        run: |
-          pnpm install --frozen-lockfile
-          pnpm run install-playwright
+      - name: Install Playwright
+        run: pnpm run install-playwright
 
       - name: Build all workers
         run: pnpm -r build:worker

.github/workflows/prereleases.yml

@@ -14,20 +14,8 @@ jobs:
         with:
           fetch-depth: 0
 
-      - name: Install pnpm
-        uses: pnpm/action-setup@v4
-        with:
-          version: 9.10.0
-
-      - name: Install Node.js 20
-        uses: actions/setup-node@v4
-        with:
-          node-version: 20
-          cache: "pnpm"
-          registry-url: "https://registry.npmjs.org"
-
       - name: Install Dependencies
-        run: pnpm i --frozen-lockfile
+        uses: ./.github/actions/install-dependencies
 
       - name: Build
         run: pnpm -F cloudflare run build