Add Swift 5.8 CI and update nightly CI to Ubuntu 22.04 (#655)

* Add Swift 5.8 CI

* Update nightly CI to Ubuntu 22.04

* Fix warnings in test target with latest NIO release

Replace calls to `.wait()` with calls to `.get()`

Author: dnadoba

Tests/AsyncHTTPClientTests/AsyncAwaitEndToEndTests.swift

@@ -416,9 +416,9 @@ final class AsyncAwaitEndToEndTests: XCTestCase {
                 XCTAssertNoThrow(try serverChannel.close().wait())
             }
             let port = serverChannel.localAddress!.port!
-            let firstClientChannel = try ClientBootstrap(group: self.serverGroup)
+            let firstClientChannel = try await ClientBootstrap(group: self.serverGroup)
                 .connect(host: "127.0.0.1", port: port)
-                .wait()
+                .get()
             defer {
                 XCTAssertNoThrow(try firstClientChannel.close().wait())
             }
@@ -464,7 +464,7 @@ final class AsyncAwaitEndToEndTests: XCTestCase {
                 .childChannelInitializer { channel in
                     channel.pipeline.addHandler(NIOSSLServerHandler(context: sslContext))
                 }
-            let serverChannel = try server.bind(host: "localhost", port: 0).wait()
+            let serverChannel = try await server.bind(host: "localhost", port: 0).get()
             defer { XCTAssertNoThrow(try serverChannel.close().wait()) }
             let port = serverChannel.localAddress!.port!
 

docker/docker-compose.2004.main.yaml renamed to docker/docker-compose.2204.58.yaml

@@ -3,16 +3,16 @@ version: "3"
 services:
 
   runtime-setup:
-    image: async-http-client:20.04-main
+    image: async-http-client:22.04-5.8
     build:
       args:
-        base_image: "swiftlang/swift:nightly-main-focal"
+        base_image: "swiftlang/swift:nightly-5.8-jammy"
 
   test:
-    image: async-http-client:20.04-main
+    image: async-http-client:22.04-5.8
     environment:
       - IMPORT_CHECK_ARG=--explicit-target-dependency-import-check error
       #- SANITIZER_ARG=--sanitize=thread
 
   shell:
-    image: async-http-client:20.04-main
+    image: async-http-client:22.04-5.8

docker/docker-compose.2204.main.yaml

@@ -0,0 +1,18 @@
+version: "3"
+
+services:
+
+  runtime-setup:
+    image: async-http-client:22.04-main
+    build:
+      args:
+        base_image: "swiftlang/swift:nightly-main-jammy"
+
+  test:
+    image: async-http-client:22.04-main
+    environment:
+      - IMPORT_CHECK_ARG=--explicit-target-dependency-import-check error
+      #- SANITIZER_ARG=--sanitize=thread
+
+  shell:
+    image: async-http-client:22.04-main