add 5.5 ci (#105)

motivation: test with 5.5

changes: add 5.5. docker-compose and pin jazzy version

Author: tomerd

docker/Dockerfile

@@ -20,7 +20,7 @@ RUN apt-get update && apt-get install -y lsof dnsutils netcat-openbsd net-tools
 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
-RUN if [ "${ubuntu_version}" != "xenial" ] ; then gem install jazzy ; fi
+RUN if [ "${ubuntu_version}" != "xenial" ] ; then gem install jazzy -v 0.13.7 ; fi
 
 # tools
 RUN mkdir -p $HOME/.tools

docker/docker-compose.2004.55.yaml

@@ -0,0 +1,17 @@
+version: "3"
+
+services:
+
+  runtime-setup:
+    image: swift-service-lifecycle:20.04-5.5
+    build:
+      args:
+        base_image: "swiftlang/swift:nightly-5.5-focal"
+
+  test:
+    image: swift-service-lifecycle:20.04-5.5
+    environment:
+      - SKIP_SIGNAL_TEST=true
+
+  shell:
+    image: swift-service-lifecycle:20.04-5.5