Use central docker script.

.deploy/docker/build-amd64.sh

@@ -30,9 +30,6 @@ curl -L -o qemu-arm-static.tar.gz https://github.com/multiarch/qemu-user-static/
 tar xzf qemu-arm-static.tar.gz && \
 popd
 
-# build image
-echo "$DOCKER_PASSWORD" | docker login -u "$DOCKER_USERNAME" --password-stdin
-
 if [ "$TRAVIS_BRANCH" == "develop" ]; then
     echo "Build develop arm"
     docker build --tag jc5x/firefly-iii:develop-arm --file Dockerfile.arm .

.deploy/docker/build-arm.sh

@@ -1,5 +1,7 @@
 #!/usr/bin/env bash
 
+# file is currently unused.
+
 docker run --rm --privileged multiarch/qemu-user-static:register --reset
 
 # get qemu-arm-static binary

.deploy/docker/travis.sh

@@ -10,6 +10,5 @@ docker version -f '{{.Server.Experimental}}'
 docker version
 
 # build everything
-.deploy/docker/build-amd64.sh
-.deploy/docker/build-arm.sh
+.deploy/docker/build-$ARCH.sh
 .deploy/docker/manifest.sh