Add composite actions for setup ChromeDriver and Node

As part of parallelising CI into multiple jobs, abstracts these
multistep proccesses into into a single step, making them easier to
reuse.

Author: theseanything

.github/actions/setup-chromedriver/action.yml

@@ -0,0 +1,21 @@
+name: 'Setup Chrome Driver'
+description: 'Install Chrome Driver'
+runs:
+  using: "composite"
+  steps:
+    - name: Setup ChromeDriver
+      uses: nanasess/setup-chromedriver@e93e57b843c0c92788f22483f1a31af8ee48db25 # v2.3.0
+      with:
+        chromedriver-version: '128.0.6613.8600'
+        chromeapp: chrome
+
+    - name: Purge Google Chrome
+      run: |
+        sudo apt-get purge google-chrome-stable
+      shell: bash
+
+    - name: Setup Chrome
+      uses: browser-actions/setup-chrome@b94431e051d1c52dcbe9a7092a4f10f827795416 # v2.1.0
+      with:
+        chrome-version: 128
+        install-chromedriver: 'false'

.github/actions/setup-node/action.yml

@@ -0,0 +1,14 @@
+name: 'Setup Node'
+description: 'Install Node and npm dependencies'
+runs:
+  using: "composite"
+  steps:
+    - name: Install Node.js
+      uses: actions/setup-node@395ad3262231945c25e8478fd5baf05154b1d79f
+      with:
+        node-version-file: ".nvmrc"
+        cache: "npm"
+
+    - name: Install JavaScript dependencies
+      shell: bash
+      run: npm ci