Added multi arch docker builds to travis ci

.travis.yml

@@ -33,6 +33,102 @@ jobs:
         - ng build --prod
       after_success: true
 
+    - stage: build_docker
+      name: amd64 docker build
+      services:
+        - docker
+      before_install:
+        - true
+      install:
+        - true
+      after_success:
+        - true
+      script:
+        - echo "$DOCKER_PASSWORD" | docker login -u "$DOCKER_USERNAME" --password-stdin
+        - docker build -f Dockerfile --tag=${DOCKER_REPO}:${TRAVIS_COMMIT}-amd64 .
+        - docker push ${DOCKER_REPO}:${TRAVIS_COMMIT}-amd64
+      on:
+        condition: '"${BUILD_DOCKER}" = 1'
+    - stage: build_docker
+      name: arm64v8 docker build
+      services:
+        - docker
+      before_install:
+        - true
+      install:
+        - true
+      after_success:
+        - true
+      script:
+        - echo "$DOCKER_PASSWORD" | docker login -u "$DOCKER_USERNAME" --password-stdin
+        # travis_wait 60 tells travis to wait for up to 60 minutes - default is 20, which is too short
+        - travis_wait 60 docker build -f Dockerfile --tag=${DOCKER_REPO}:${TRAVIS_COMMIT}-arm64v8 .
+        - docker push ${DOCKER_REPO}:${TRAVIS_COMMIT}-arm64v8
+      arch: arm64
+      on:
+        condition: '"${BUILD_DOCKER}" = 1'
+    
+    - stage: build_docker
+      name: arm32v7 docker build
+      services:
+        - docker
+      before_install:
+        - true
+      install:
+        - true
+      after_success:
+        - true
+      script:
+        - echo "$DOCKER_PASSWORD" | docker login -u "$DOCKER_USERNAME" --password-stdin
+        # register binfmt stuff for qemu-static binaries so we can use userland-emulation
+        - docker run --rm --privileged multiarch/qemu-user-static --reset -p yes
+        # replace the multi-arch reference with a specific, arm32v7 version. else docker will use the platform specific one,
+        # which is amd64.
+        - sed -i 's/FROM node:15/FROM node@sha256:e9bf2028bd59399afd3f6665f427a07b7ddfee07cffdf2061c39d991a3b3e332/g' Dockerfile
+        - sed -i 's/FROM python:3.7-slim/FROM python@sha256:843dd86fa35b923095b5db60c6e2e296013d647c8327aeba0e7638e7f0a43373/g' Dockerfile
+        # travis_wait 60 tells travis to wait for up to 60 minutes - default is 20, which is too short
+        - travis_wait 60 docker build -f Dockerfile --tag=${DOCKER_REPO}:${TRAVIS_COMMIT}-arm32v7 .
+        - docker push ${DOCKER_REPO}:${TRAVIS_COMMIT}-arm32v7
+      on:
+        condition: '"${BUILD_DOCKER}" = 1'
+    
+    - stage: publish_manifest
+      env:
+        - DOCKER_CLI_EXPERIMENTAL=enabled # required for manifest support
+      services:
+        - docker
+      before_install:
+        - true
+      install:
+        - true
+      after_success:
+        - true
+      script:
+        - echo "$DOCKER_PASSWORD" | docker login -u "$DOCKER_USERNAME" --password-stdin
+        - docker manifest create ${DOCKER_REPO}:${TRAVIS_COMMIT} ${DOCKER_REPO}:${TRAVIS_COMMIT}-amd64 ${DOCKER_REPO}:${TRAVIS_COMMIT}-arm64v8 ${DOCKER_REPO}:${TRAVIS_COMMIT}-arm32v7 ${DOCKER_REPO}:${TRAVIS_COMMIT}-arm32v6
+        - docker manifest annotate ${DOCKER_REPO}:${TRAVIS_COMMIT} ${DOCKER_REPO}:${TRAVIS_COMMIT}-arm32v7 --os linux --arch arm --variant v7
+        - docker manifest annotate ${DOCKER_REPO}:${TRAVIS_COMMIT} ${DOCKER_REPO}:${TRAVIS_COMMIT}-arm64v8 --os linux --arch arm64 --variant v8
+        - docker manifest push --purge ${DOCKER_REPO}:${TRAVIS_COMMIT}
+        - |
+          if [ "${TRAVIS_BRANCH}" = "master" ]; then
+            echo "Master branch detected"
+            DOCKER_TAG="latest"
+          else
+            DOCKER_TAG=${TRAVIS_TAG}
+          fi
+        - |
+          if [ "${DOCKER_TAG}" != "" ]; then
+            echo "Create Tag ${DOCKER_TAG}"
+            docker manifest create ${DOCKER_REPO}:${DOCKER_TAG} ${DOCKER_REPO}:${TRAVIS_COMMIT}-amd64 ${DOCKER_REPO}:${TRAVIS_COMMIT}-arm64v8 ${DOCKER_REPO}:${TRAVIS_COMMIT}-arm32v7 ${DOCKER_REPO}:${TRAVIS_COMMIT}-arm32v6
+            docker manifest annotate ${DOCKER_REPO}:${DOCKER_TAG} ${DOCKER_REPO}:${TRAVIS_COMMIT}-arm32v7 --os linux --arch arm --variant v7
+            docker manifest annotate ${DOCKER_REPO}:${DOCKER_TAG} ${DOCKER_REPO}:${TRAVIS_COMMIT}-arm64v8 --os linux --arch arm64 --variant v8
+            docker manifest push --purge ${DOCKER_REPO}:${DOCKER_TAG}
+          else
+            echo "Not a tag and not on master, so not pushing tag/master specific manifest"
+          fi
+      on:
+        condition: '"${BUILD_DOCKER}" = 1'
+
 
 before_install:
   - sudo apt-get update -qq