add docker setup for 5.4 and nightly

motivation: CI for 5.4 and latest

changes: add docker setup files for 5.4 and main nightly images

docker/Dockerfile

@@ -17,8 +17,11 @@ 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
+RUN apt-get update && apt-get install -y ruby ruby-dev libsqlite3-dev build-essential
+# switch of gem docs building
+RUN echo "gem: --no-document" > ~/.gemrc
+# jazzy no longer works on xenial as ruby is too old.
+RUN if [ "${ubuntu_version}" != "xenial" ] ; then  gem install jazzy; fi
 
 # tools
 RUN mkdir -p $HOME/.tools

docker/docker-compose.2004.54.yaml

@@ -0,0 +1,17 @@
+version: "3"
+
+services:
+
+  runtime-setup:
+    image: swift-metrics:20.04-5.4
+    build:
+      args:
+        base_image: "swiftlang/swift:nightly-5.4-focal"
+
+  test:
+    image: swift-metrics:20.04-5.4
+    environment: []
+      #- SANITIZER_ARG=--sanitize=thread
+
+  shell:
+    image: swift-metrics:20.04-5.4

docker/docker-compose.2004.main.yaml

@@ -0,0 +1,17 @@
+version: "3"
+
+services:
+
+  runtime-setup:
+    image: swift-metrics:20.04-main
+    build:
+      args:
+        base_image: "swiftlang/swift:nightly-main-focal"
+
+  test:
+    image: swift-metrics:20.04-main
+    environment: []
+      #- SANITIZER_ARG=--sanitize=thread
+
+  shell:
+    image: swift-metrics:20.04-main