feat: add cache busting for builds

.github/workflows/build-and-push.yml

@@ -74,8 +74,9 @@ jobs:
             "LOCALE=${{ matrix.locales.locale }}"
           # Cache for individual languages
           # Ref: https://docs.docker.com/build/cache/backends/gha/#scope
-          cache-from: type=gha,scope=${{env.GITHUB_REF_NAME}}${{matrix.locales.postfix}}
-          cache-to: type=gha,mode=max,scope=${{env.GITHUB_REF_NAME}}${{matrix.locales.postfix}}
+          # Cache busting idea from: https://stackoverflow.com/a/64819132 to handle i18n update issue
+          cache-from: type=gha,scope=${{env.GITHUB_REF_NAME}}${{matrix.locales.postfix}}${{env.DOCKER_BUILD_CACHE_BUST}}
+          cache-to: type=gha,mode=max,scope=${{env.GITHUB_REF_NAME}}${{matrix.locales.postfix}}${{env.DOCKER_BUILD_CACHE_BUST}}
 
       - name: Image digest
         run: echo ${{ steps.docker_build.outputs.digest }}

Dockerfile

@@ -12,7 +12,7 @@ RUN npm install
 COPY . .
 
 ARG LOCALE=en_US
-RUN NODE_ENV=production CACHE_BUST=1 npm run build
+RUN NODE_ENV=production npm run build
 RUN npm prune --production
 
 #########################################

README.md

@@ -183,6 +183,12 @@ On Heroku, please set `LOCALE` to one of `en_US`, `zh_TW` or any other language
 
 If you want to build using docker instead, you may need to modify Dockerfile to include the desired `LOCALE`.
 
+#### Busting Github Action build cache
+
+Docker build step in Github action are cached, and may contain outdated translation files.
+
+Update the repository variable `DOCKER_BUILD_CACHE_BUST` to skip previous caches.
+
 ### Notification setup
 - Prerequisites :
   1. [LIFF setup](https://github.com/cofacts/rumors-line-bot#liff-setup)