feat: Have travis bump submodule commits in docker build repository (#35216)

- [x] I have read [freeCodeCamp's contribution guidelines](https://github.com/freeCodeCamp/freeCodeCamp/blob/master/CONTRIBUTING.md).
- [x] My pull request has a descriptive title (not a vague title like `Update index.md`)
- [x] My pull request targets the `master` branch of freeCodeCamp.

Co-authored-by: mrugesh mohapatra <1884376+raisedadead@users.noreply.github.com>

.travis.yml

@@ -21,5 +21,12 @@ before_script:
   - git config --global user.email team+camperbot@freeCodeCamp.org
   - git config --global user.name "CamperBot"
 
-script:
-  - npm run test
+jobs:
+  include:
+    - stage: Unit and Integration tests
+      script: npm test
+
+    - stage: Artifacts builds
+      if: branch = master && type != pull_request
+      script: bash trigger-build.sh
+ 

trigger-build.sh

@@ -0,0 +1,16 @@
+#!/usr/bin/env bash
+pushd "$TRAVIS_BUILD_DIR"
+
+if [ -n "$DOCKER_PUSH_API_TOKEN" ]
+then
+  git clone https://github.com/"$DOCKER_PUSH_REPO".git docker-push-repo
+
+  cd docker-push-repo/freecodecamp
+  git pull --rebase origin master
+  cd ../
+  git add freecodecamp
+  git -c user.name="$DOCKER_PUSH_USER" -c user.email='travis' \
+    commit -m 'chore(ci): Travis CI - bump submodule'
+  git push https://"$DOCKER_PUSH_USER":"$DOCKER_PUSH_API_TOKEN"@github.com/"$DOCKER_PUSH_REPO".git master
+fi
+popd