Implement Node.js caching in the GitHub Actions workflows

The `setup-node` action contains built-in support for caching [1], so
this commit makes sure we use it for all Node.js-based workflows to
reduce workflow execution time.

Note that, contrary what one might expect [2], the `node_modules`
directory is deliberately not cached because it can conflict with
differing Node.js versions and because it's not useful in combination
with `npm ci` usage which wipes the `node_modules` folder
unconditionally. Therefore, the action instead caches the global `npm`
cache directory instead which does not suffer from these problems and
still provides a speed-up at installation time.

[1] https://github.com/actions/setup-node?tab=readme-ov-file#caching-global-packages-data
[2] https://github.com/actions/setup-node/issues/416
[3] https://github.com/actions/cache/issues/67

.github/workflows/ci.yml

@@ -24,6 +24,7 @@ jobs:
         uses: actions/setup-node@53b83947a5a98c8d113130e565377fae1a50d02f # v6
         with:
           node-version: ${{ matrix.node-version }}
+          cache: 'npm'
 
       - name: Install dependencies
         run: npm ci

.github/workflows/coverage.yml

@@ -25,6 +25,7 @@ jobs:
         uses: actions/setup-node@53b83947a5a98c8d113130e565377fae1a50d02f # v6
         with:
           node-version: ${{ matrix.node-version }}
+          cache: 'npm'
 
       - name: Install dependencies
         run: npm ci

.github/workflows/font_tests.yml

@@ -46,6 +46,7 @@ jobs:
         uses: actions/setup-node@53b83947a5a98c8d113130e565377fae1a50d02f # v6
         with:
           node-version: ${{ matrix.node-version }}
+          cache: 'npm'
 
       - name: Install dependencies
         run: npm ci

.github/workflows/lint.yml

@@ -24,6 +24,7 @@ jobs:
         uses: actions/setup-node@53b83947a5a98c8d113130e565377fae1a50d02f # v6
         with:
           node-version: ${{ matrix.node-version }}
+          cache: 'npm'
 
       - name: Install dependencies
         run: npm ci

.github/workflows/prefs_tests.yml

@@ -24,6 +24,7 @@ jobs:
         uses: actions/setup-node@53b83947a5a98c8d113130e565377fae1a50d02f # v6
         with:
           node-version: ${{ matrix.node-version }}
+          cache: 'npm'
 
       - name: Install dependencies
         run: npm ci

.github/workflows/publish_release.yml

@@ -26,6 +26,7 @@ jobs:
         uses: actions/setup-node@53b83947a5a98c8d113130e565377fae1a50d02f # v6
         with:
           node-version: ${{ matrix.node-version }}
+          cache: 'npm'
           registry-url: 'https://registry.npmjs.org'
 
       - name: Install dependencies

.github/workflows/publish_website.yml

@@ -26,6 +26,7 @@ jobs:
         uses: actions/setup-node@53b83947a5a98c8d113130e565377fae1a50d02f # v6
         with:
           node-version: ${{ matrix.node-version }}
+          cache: 'npm'
 
       - name: Install dependencies
         run: npm ci

.github/workflows/types_tests.yml

@@ -24,6 +24,7 @@ jobs:
         uses: actions/setup-node@53b83947a5a98c8d113130e565377fae1a50d02f # v6
         with:
           node-version: ${{ matrix.node-version }}
+          cache: 'npm'
 
       - name: Install dependencies
         run: npm ci

.github/workflows/update_locales.yml

@@ -24,6 +24,7 @@ jobs:
         uses: actions/setup-node@53b83947a5a98c8d113130e565377fae1a50d02f # v6
         with:
           node-version: lts/*
+          cache: 'npm'
 
       - name: Install dependencies
         run: npm ci