Add action for CLI download.

Author: michaelnebel

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

@@ -0,0 +1,35 @@
+name: Setup CodeQL CLI
+description: |
+  Install a CodeQL CLI or re-use an existing one from the cache and it to the path.
+inputs:
+  codeql-cli-version:
+    description: |
+      The version of the CodeQL CLI to be downloaded.
+
+runs:
+  using: composite
+  steps:
+      # TODO: Consider to introduce caching for the CodeQL CLI.
+    - name: Install CodeQL
+      # if: steps.cache-codeql.outputs.cache-hit != 'true'
+      shell: bash
+      env:
+        GITHUB_TOKEN: ${{ github.token }}
+        CODEQL_HOME: ${{ github.workspace }}/codeql_home
+        CODEQL_CLI_VERSION: ${{ inputs.codeql-cli-version }}
+      run: |
+        mkdir -p $CODEQL_HOME
+        echo "Change directory to $CODEQL_HOME"
+        pushd $CODEQL_HOME
+
+        echo "Downloading CodeQL CLI v${CODEQL_CLI_VERSION}."
+        gh release download "v${CODEQL_CLI_VERSION}" --repo https://github.com/github/codeql-cli-binaries --pattern codeql-linux64.zip
+
+        echo "Unzipping CodeQL CLI."
+        unzip -q codeql-linux64.zip
+
+        popd
+
+        echo "Adding CodeQL CLI to the PATH."
+        echo "$CODEQL_HOME/codeql" >> $GITHUB_PATH
+        echo "Done."

.github/workflows/ci.yml

@@ -25,28 +25,11 @@ jobs:
             src:
               - '${{ matrix.language }}/**'
 
-      # TODO: Consider to introduce caching for the CodeQL CLI.
-      - name: Install CodeQL
-        shell: bash
-        env:
-          GITHUB_TOKEN: ${{ github.token }}
-          CODEQL_HOME: ${{ github.workspace }}/codeql_home
-        run: |
-          mkdir -p $CODEQL_HOME
-          echo "Change directory to $CODEQL_HOME"
-          pushd $CODEQL_HOME
-
-          echo "Downloading CodeQL CLI"
-          gh release download v2.19.2 --repo https://github.com/github/codeql-cli-binaries --pattern codeql-linux64.zip
-
-          echo "Unzipping CodeQL CLI"
-          unzip -q codeql-linux64.zip
-
-          popd
+      - name: Setup CodeQL
+        uses: ./.github/actions/install-codeql
+        with:
+          codeql-cli-version: 2.19.2
 
-          echo "Adding CodeQL CLI to PATH"
-          echo "$CODEQL_HOME/codeql" >> $GITHUB_PATH
-        
       - name: Install Packs
         if: steps.changes.outputs.src == 'true'
         env: