Fixes pre-commit git hook to ensure the optimisation of staged icons (#958)

* testing

* Fixes pre-commit hook

* Removing checkIcons from pre commit hook because it might result in false positives and negatives on an unclean local repository

* Added checkIcons Github action

---------

Co-authored-by: Karsa <karsa@karsa.org>

.github/actions/check-icons.yml

@@ -0,0 +1,41 @@
+name: "Check icons"
+description: "Cross-checks icon and category references in JSON descriptors"
+
+inputs:
+  name:
+    description: “Name of the package”
+    required: true
+
+runs:
+  using: "composite"
+  steps:
+    - uses: actions/checkout@v3
+    - uses: actions/setup-node@v3
+      with:
+        node-version: 16
+
+    - uses: pnpm/action-setup@v2.0.1
+      name: Install pnpm
+      id: pnpm-install
+      with:
+        version: 7
+        run_install: false
+
+    - name: Get pnpm store directory
+      id: pnpm-cache
+      run: |
+        echo "::set-output name=pnpm_cache_dir::$(pnpm store path)"
+
+    - uses: actions/cache@v3
+      name: Setup pnpm cache
+      with:
+        path: ${{ steps.pnpm-cache.outputs.pnpm_cache_dir }}
+        key: ${{ runner.os }}-lucide-preact-pnpm-store-${{ hashFiles('**/pnpm-lock.yaml') }}
+        restore-keys: |
+          ${{ runner.os }}-lucide-preact-pnpm-store-
+
+    - name: Install dependencies
+      run: pnpm install --filter .
+
+    - name: Check icons and categories
+      run: pnpm checkIcons