add 5.10 ci setup (swift-server#309)

motivaiton: test for upcoming 5.10 release

changes: add docker setup for stable 5.9 and nightly 5.10

Author: tomerd

docker/docker-compose.al2.510.yaml

@@ -0,0 +1,18 @@
+version: "3"
+
+services:
+
+  runtime-setup:
+    image: swift-aws-lambda:al2-5.10
+    build:
+      args:
+        base_image: "swiftlang/swift:nightly-5.10-amazonlinux2"
+
+  test:
+    image: swift-aws-lambda:al2-5.10
+
+  test-examples:
+    image: swift-aws-lambda:al2-5.10
+
+  shell:
+    image: swift-aws-lambda:al2-5.10

docker/docker-compose.al2.59.yaml

@@ -6,7 +6,7 @@ services:
     image: swift-aws-lambda:al2-5.9
     build:
       args:
-        base_image: "swiftlang/swift:nightly-5.9-amazonlinux2"
+        swift_version: "5.9"
 
   test:
     image: swift-aws-lambda:al2-5.9