Adding caching to the Setup CodeQL action.

Author: michaelnebel

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

@@ -9,9 +9,17 @@ inputs:
 runs:
   using: composite
   steps:
-      # TODO: Consider to introduce caching for the CodeQL CLI.
+    - name: Cache CodeQL
+        id: cache-codeql
+        uses: actions/cache@v4
+        with:
+          # A list of files, directories, and wildcard patterns to cache and restore
+          path: ${{github.workspace}}/codeql_home
+          # An explicit key for restoring and saving the cache
+          key: codeql-home-${{ inputs.codeql-cli-version }}
+  
     - name: Install CodeQL
-      # if: steps.cache-codeql.outputs.cache-hit != 'true'
+      if: steps.cache-codeql.outputs.cache-hit != 'true'
       shell: bash
       env:
         GITHUB_TOKEN: ${{ github.token }}