add docker support

motivation: enable CI

changes: add docker files support for ubuntu 16.04 and 18.04 and swift 5.0 and 5.1

note that eventyally this will need to move to AL2 docker images, but we dont have official ones yet

Author: tomerd

docker/Dockerfile

@@ -0,0 +1,35 @@
+ARG swift_version=5.0
+ARG ubuntu_version=bionic
+FROM swift:$swift_version-$ubuntu_version
+# needed to do again after FROM due to docker limitation
+ARG swift_version
+ARG ubuntu_version
+
+# set as UTF-8
+RUN apt-get update && apt-get install -y locales locales-all
+ENV LC_ALL en_US.UTF-8
+ENV LANG en_US.UTF-8
+ENV LANGUAGE en_US.UTF-8
+
+# dependencies
+RUN apt-get update && apt-get install -y wget
+RUN apt-get update && apt-get install -y lsof dnsutils netcat-openbsd net-tools curl jq # used by integration tests
+
+# ruby and jazzy for docs generation
+RUN apt-get update && apt-get install -y ruby ruby-dev libsqlite3-dev
+RUN gem install jazzy --no-ri --no-rdoc
+
+# tools
+RUN mkdir -p $HOME/.tools
+RUN echo 'export PATH="$HOME/.tools:$PATH"' >> $HOME/.profile
+
+# script to allow mapping framepointers on linux (until part of the toolchain)
+RUN wget -q https://raw.githubusercontent.com/apple/swift/master/utils/symbolicate-linux-fatal -O $HOME/.tools/symbolicate-linux-fatal
+RUN chmod 755 $HOME/.tools/symbolicate-linux-fatal
+
+# swiftformat (until part of the toolchain)
+
+ARG swiftformat_version=0.40.12
+RUN git clone --branch $swiftformat_version --depth 1 https://github.com/nicklockwood/SwiftFormat $HOME/.tools/swift-format
+RUN cd $HOME/.tools/swift-format && swift build -c release
+RUN ln -s $HOME/.tools/swift-format/.build/release/swiftformat $HOME/.tools/swiftformat

docker/docker-compose.1604.51.yaml

@@ -0,0 +1,16 @@
+version: "3"
+
+services:
+
+  runtime-setup:
+    image: swift-aws-lambda:16.04-5.1
+    build:
+      args:
+        ubuntu_version: "xenial"
+        swift_version: "5.1"
+
+  test:
+    image: swift-aws-lambda:16.04-5.1
+
+  shell:
+    image: swift-aws-lambda:16.04-5.1

docker/docker-compose.1804.50.yaml

@@ -0,0 +1,16 @@
+version: "3"
+
+services:
+
+  runtime-setup:
+    image: swift-aws-lambda:18.04-5.0
+    build:
+      args:
+        ubuntu_version: "bionic"
+        swift_version: "5.0"
+
+  test:
+    image: swift-aws-lambda:18.04-5.0
+
+  shell:
+    image: swift-aws-lambda:18.04-5.0

docker/docker-compose.yaml

@@ -0,0 +1,37 @@
+# this file is not designed to be run directly
+# instead, use the docker-compose.<os>.<swift> files
+# eg docker-compose -f docker/docker-compose.yaml -f docker/docker-compose.1804.50.yaml run test
+version: "3"
+
+services:
+
+  runtime-setup:
+    image: swift-aws-lambda:default
+    build:
+      context: .
+      dockerfile: Dockerfile
+
+  common: &common
+    image: swift-aws-lambda:default
+    depends_on: [runtime-setup]
+    volumes:
+      - ~/.ssh:/root/.ssh
+      - ..:/code:z
+    working_dir: /code
+    cap_drop:
+      - CAP_NET_RAW
+      - CAP_NET_BIND_SERVICE
+
+  sanity:
+    <<: *common
+    command: /bin/bash -cl "./scripts/sanity.sh"
+
+  test:
+    <<: *common
+    command: /bin/bash -cl "swift test -Xswiftc -warnings-as-errors"
+
+  # util
+
+  shell:
+    <<: *common
+    entrypoint: /bin/bash