Restructure install procedure for Travis build

.travis.yml

@@ -45,11 +45,10 @@ cache:
 # Install yarn as Travis doesn't support it out of the box
 before_install: npm install -g yarn
 
-# Do not install optional dependencies by default
-install: yarn install --ignore-optional
-
 # Install dependencies
-before_script: pip install --user -r requirements.txt
+install:
+  - yarn install --ignore-optional
+  - pip install --user -r requirements.txt
 
 # Perform build and tests
 script: yarn run build
@@ -69,12 +68,12 @@ matrix:
 
       # If we're not on a release branch, exit early and indicate success
       #before_install: echo "$TRAVIS_BRANCH" | grep -qE "^[0-9.]+$" && exit 0;
-
-      # Don't install anything, as we're only using the pre-built files
-      install: ":"
+      # TODO: only for debugging
+      before_install: TRAVIS_BRANCH_X=1.0.5
 
       # Install wheel for build
-      before_script: pip install wheel
+      install:
+        - pip install wheel
 
       # Perform build
       script:
@@ -86,11 +85,11 @@ matrix:
 
         # Install twine and push release to PyPI
         - pip install twine
-        #- twine upload -u $PYPI_USER -p $PYPI_PASS dist/*
+        #- twine upload -u $PYPI_USERNAME -p $PYPI_PASSWORD dist/*
 
         # Push to Docker Hub
-        - docker login -e $DOCKER_EMAIL -u $DOCKER_USERNAME -p $DOCKER_PASSWORD
-        - docker tag $TRAVIS_REPO_SLUG $TRAVIS_REPO_SLUG:$TRAVIS_BRANCH
+        - docker login -u $DOCKER_USERNAME -p $DOCKER_PASSWORD
+        - docker tag $TRAVIS_REPO_SLUG $TRAVIS_REPO_SLUG:$TRAVIS_BRANCH_X
         - docker tag $TRAVIS_REPO_SLUG $TRAVIS_REPO_SLUG:latest
         - docker push $TRAVIS_REPO_SLUG