Improved building process so that already generated dist files are reused when building docker image is possible

.dockerignore

@@ -1,7 +1,6 @@
 ./.github
 ./build
 ./coverage
-./dist
 ./node_modules
 ./test
 ./shlink-web-client.gif

.travis.yml

@@ -28,7 +28,7 @@ after_success:
 
 # Before deploying, build dist file for current travis tag
 before_deploy:
-  - npm run build ${TRAVIS_TAG#?}
+  - if [[ ! -z $TRAVIS_TAG ]]; then npm run build ${TRAVIS_TAG#?} ; fi
 
 deploy:
   - provider: script

Dockerfile

@@ -2,7 +2,13 @@ FROM node:12.14.1-alpine as node
 COPY . /shlink-web-client
 ARG VERSION="latest"
 ENV VERSION ${VERSION}
-RUN cd /shlink-web-client && npm install && npm run build -- ${VERSION} --no-dist
+RUN cd /shlink-web-client && \
+    UNCOMPRESSED="shlink-web-client_${VERSION}_dist" && \
+    DIST_FILE="./dist/${UNCOMPRESSED}.zip" && \
+    # If a dist file already exists, just unzip it
+    if [[ -f ${DIST_FILE} ]]; then unzip ${DIST_FILE} && mv ./${UNCOMPRESSED} ./build ; fi && \
+    # If no dist file exsts, build from scratch
+    if [[ ! -f ${DIST_FILE} ]]; then npm install && npm run build -- ${VERSION} --no-dist ; fi
 
 FROM nginx:1.17.7-alpine
 LABEL maintainer="Alejandro Celaya <alejandro@alejandrocelaya.com>"