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

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

Author: GeekMasher

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

@@ -32,7 +32,12 @@ runs:
         CODEQL_CLI_VERSION: ${{ inputs.codeql-cli-version }}
       run: |
         if [ -z "$CODEQL_CLI_VERSION" ]; then
-          echo "No CodeQL CLI version specified. Reading from .codeqlversion file."
+          echo "No CodeQL CLI version specified. Checking for .codeqlversion file."
+          if [ ! -f ./.codeqlversion ]; then
+            echo "Error: .codeqlversion file not found. Please specify a CodeQL CLI version." >&2
+            exit 1
+          fi
+          echo "Reading CodeQL CLI version from .codeqlversion file."
           CODEQL_CLI_VERSION=$(cat ./.codeqlversion)
         fi
         echo "Installing CodeQL CLI v${CODEQL_CLI_VERSION}."