feat(ci-build): Initial travis / semantic release scripts

.gitmodules

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+[submodule "build"]
+	path = build
+	url = https://github.com/nikkoura/semantic-release-ci-docker.git

travis.yml

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+language: shell
+
+env:
+  global:
+    - IMAGE_BASE_NAME=${IMAGE_BASE_NAME}
+
+jobs:
+  include:
+    - stage: "build and test"
+      name: build-amd64
+      arch: amd64
+      workspaces:
+        create:
+          name: docker-image-amd64
+          paths:
+            - image-amd64.tar
+      os: linux
+      language: shell
+      script:
+        - IMAGE_VERSION=${TRAVIS_BRANCH} build/build-arch.sh
+        #TODO: call test script if available
+    - name: build-arm64
+      arch: arm64
+      workspaces:
+        create:
+          name: docker-image-arm64
+          paths:
+            - image-arm64.tar
+      os: linux
+      language: shell
+      script:
+        - IMAGE_VERSION=${TRAVIS_BRANCH} build/build-arch.sh
+        #TODO: call test script if available
+
+    - stage: auto-tag
+      language: node_js
+      arch: amd64
+      os: linux
+      node_js: lts/*
+      if: tag IS blank AND branch = master AND type != pull_request AND fork = false
+      script:
+        - build/autotag.sh
+
+    - stage: push
+      arch: amd64
+      os: linux
+      language: shell
+      if: tag IS present and fork = false
+      workspaces:
+        use:
+          - docker-image-amd64
+          - docker-image-arm64
+      script:
+        - docker image load -i image-amd64.tar
+        - IMAGE_VERSION=${TRAVIS_TAG} TARGET_ARCH=amd64 build/push-arch.sh
+        - docker image load -i image-arm64.tar
+        - IMAGE_VERSION=${TRAVIS_TAG} TARGET_ARCH=arm64 build/push-arch.sh
+
+    - stage: manifest
+      language: shell
+      arch: amd64
+      os: linux
+      if: tag IS present and fork = false
+      script:
+        - IMAGE_VERSION=${TRAVIS_TAG} build/manifest.sh