Re-enable CodeQL for Javascript (#1209)

* Create codeql-config.yml

* Update codeql-analysis.yml

Add config to exclude certain files

.github/codeql/codeql-config.yml

@@ -0,0 +1,4 @@
+name: "CodeQL config"
+
+paths-ignore:
+  - docs/flattener/flattener.js

.github/workflows/codeql-analysis.yml

@@ -29,8 +29,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        language: [ 'go' ]
-        #language: [ 'go', 'javascript' ]
+        language: [ 'go', 'javascript' ]
         # CodeQL supports [ 'cpp', 'csharp', 'go', 'java', 'javascript', 'python' ]
         # Learn more:
         # https://docs.github.com/en/free-pro-team@latest/github/finding-security-vulnerabilities-and-errors-in-your-code/configuring-code-scanning#changing-the-languages-that-are-analyzed
@@ -44,6 +43,7 @@ jobs:
       uses: github/codeql-action/init@v1
       with:
         languages: ${{ matrix.language }}
+        config-file: ./.github/codeql/codeql-config.yml
         # If you wish to specify custom queries, you can do so here or in a config file.
         # By default, queries listed here will override any specified in a config file.
         # Prefix the list here with "+" to use these queries and those in the config file.