Moved docker image build to github actions

docker/build

@@ -2,33 +2,26 @@
 
 set -e
 
-# PLATFORMS="linux/arm/v7,linux/arm64/v8,linux/amd64"
-PLATFORMS="linux/amd64"
+PLATFORMS="linux/arm/v7,linux/arm64/v8,linux/amd64"
+# PLATFORMS="linux/amd64"
 DOCKER_IMAGE="shlinkio/shlink"
-BUILDX_VER=v0.4.1
-export DOCKER_CLI_EXPERIMENTAL=enabled
-
-mkdir -vp ~/.docker/cli-plugins/ ~/dockercache
-curl --silent -L "https://github.com/docker/buildx/releases/download/${BUILDX_VER}/buildx-${BUILDX_VER}.linux-amd64" > ~/.docker/cli-plugins/docker-buildx
-chmod a+x ~/.docker/cli-plugins/docker-buildx
-
-docker buildx create --use
 
 echo "$DOCKER_PASSWORD" | docker login -u "$DOCKER_USERNAME" --password-stdin
+echo "Building version $GITHUB_REF"
 
-# If there is a tag, regardless the branch, build that docker tag and also "stable"
-if [[ ! -z $TRAVIS_TAG ]]; then
-  TAGS="-t ${DOCKER_IMAGE}:${TRAVIS_TAG#?}"
+# If ref is not develop, then this is a tag. Build that docker tag and also "stable"
+if [[ "$GITHUB_REF" != *"develop"* ]]; then
+  TAGS="-t ${DOCKER_IMAGE}:${GITHUB_REF#?}"
   # Push stable tag only if this is not an alpha or beta tag
-  [[ $TRAVIS_TAG != *"alpha"* && $TRAVIS_TAG != *"beta"* ]] && TAGS="${TAGS} -t ${DOCKER_IMAGE}:stable"
+  [[ $GITHUB_REF != *"alpha"* && $GITHUB_REF != *"beta"* ]] && TAGS="${TAGS} -t ${DOCKER_IMAGE}:stable"
 
   docker buildx build --push \
-    --build-arg SHLINK_VERSION=${TRAVIS_TAG#?} \
+    --build-arg SHLINK_VERSION=${GITHUB_REF#?} \
     --platform ${PLATFORMS} \
     ${TAGS} .
 
-# If build branch is develop, build latest (on main branch, when there's no tag, do not build anything)
-elif [[ "$TRAVIS_BRANCH" == 'develop' ]]; then
+# If build branch is develop, build latest
+elif [[ "$GITHUB_REF" == *"develop"* ]]; then
   docker buildx build --push \
     --platform ${PLATFORMS} \
     -t ${DOCKER_IMAGE}:latest .