Add tests for different Postgres client libraries (#2008)

* Add tests for different postgres clients
* test/fixtures: sanitize test name for test_output_dir
* test/fixtures: do not look for etcd before runtime
* Add workflow for testing Postgres client libraries

test_runner/pg_clients/swift/PostgresClientKitExample/.dockerignore

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+.build/

test_runner/pg_clients/swift/PostgresClientKitExample/.gitignore

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+.build/

test_runner/pg_clients/swift/PostgresClientKitExample/Dockerfile

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+FROM swift:5.6 AS build
+RUN apt-get -q update && apt-get -q install -y libssl-dev
+WORKDIR /source
+
+COPY . .
+RUN swift build --configuration release
+
+FROM swift:5.6
+WORKDIR /app
+COPY --from=build /source/.build/release/release .
+CMD ["/app/PostgresClientKitExample"]

test_runner/pg_clients/swift/PostgresClientKitExample/Package.resolved

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+{
+  "pins" : [
+    {
+      "identity" : "bluesocket",
+      "kind" : "remoteSourceControl",
+      "location" : "https://github.com/IBM-Swift/BlueSocket.git",
+      "state" : {
+        "revision" : "dd924c3bc2c1c144c42b8dda3896f1a03115ded4",
+        "version" : "2.0.2"
+      }
+    },
+    {
+      "identity" : "bluesslservice",
+      "kind" : "remoteSourceControl",
+      "location" : "https://github.com/IBM-Swift/BlueSSLService",
+      "state" : {
+        "revision" : "c249988fb748749739144e7f554710552acdc0bd",
+        "version" : "2.0.1"
+      }
+    },
+    {
+      "identity" : "postgresclientkit",
+      "kind" : "remoteSourceControl",
+      "location" : "https://github.com/codewinsdotcom/PostgresClientKit.git",
+      "state" : {
+        "branch" : "v1.4.3",
+        "revision" : "beafedaea6dc9f04712e9a8547b77f47c406a47e"
+      }
+    },
+    {
+      "identity" : "swift-argument-parser",
+      "kind" : "remoteSourceControl",
+      "location" : "https://github.com/apple/swift-argument-parser",
+      "state" : {
+        "revision" : "6b2aa2748a7881eebb9f84fb10c01293e15b52ca",
+        "version" : "0.5.0"
+      }
+    }
+  ],
+  "version" : 2
+}

test_runner/pg_clients/swift/PostgresClientKitExample/Package.swift

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+// swift-tools-version:5.6
+import PackageDescription
+
+let package = Package(
+    name: "PostgresClientKitExample",
+    dependencies: [
+        .package(
+            url: "https://github.com/codewinsdotcom/PostgresClientKit.git",
+            revision: "v1.4.3"
+        )
+    ],
+    targets: [
+        .target(
+            name: "PostgresClientKitExample",
+            dependencies: [ "PostgresClientKit" ])
+    ]
+)

test_runner/pg_clients/swift/PostgresClientKitExample/Sources/PostgresClientKitExample/main.swift

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+import Foundation
+
+import PostgresClientKit
+
+do {
+    var configuration = PostgresClientKit.ConnectionConfiguration()
+
+    let env = ProcessInfo.processInfo.environment
+    if let host = env["NEON_HOST"] {
+        configuration.host = host
+    }
+    if let database = env["NEON_DATABASE"] {
+        configuration.database = database
+    }
+    if let user = env["NEON_USER"] {
+        configuration.user = user
+    }
+    if let password = env["NEON_PASSWORD"] {
+        configuration.credential = .scramSHA256(password: password)
+    }
+
+    let connection = try PostgresClientKit.Connection(configuration: configuration)
+    defer { connection.close() }
+
+    let text = "SELECT 1;"
+    let statement = try connection.prepareStatement(text: text)
+    defer { statement.close() }
+
+    let cursor = try statement.execute(parameterValues: [ ])
+    defer { cursor.close() }
+
+    for row in cursor {
+        let columns = try row.get().columns
+        print(columns[0])
+    }
+} catch {
+    print(error)
+}