Add workflow for GH Actions (#5)

* Add workflow

* Adjust container

* Try being more explicit?

* Try removing method

.github/workflows/linux.yml

@@ -0,0 +1,13 @@
+name: test
+on: { pull_request: {} }
+
+jobs:      
+  test-queues:
+    runs-on: ubuntu-latest
+    container: swift:5.5.1-focal
+    steps: 
+      - name: Check out
+        uses: actions/checkout@v2
+      - name: Build
+        timeout-minutes: 30
+        run: swift build -c release

Dockerfile

@@ -0,0 +1,17 @@
+# Build image
+# ================================
+FROM swift:5.5.1-focal as build
+WORKDIR /build
+
+# First just resolve dependencies.
+# This creates a cached layer that can be reused
+# as long as your Package.swift/Package.resolved
+# files do not change.
+COPY ./Package.* ./
+RUN swift package resolve
+
+# Copy entire repo into container
+COPY . .
+
+# Compile with optimizations
+RUN swift build -c release

Sources/OneRoster/Client/OneRosterClient.swift

@@ -140,15 +140,15 @@ extension URLComponents {
     ///
     /// The `queryItems` array is created if it is currently `nil`.
     public mutating func appendQueryItem(name: String, value: String? = nil) {
-        self.queryItems = (self.queryItems ?? []) + [.init(name: name, value: value)]
+        self.queryItems = (self.queryItems ?? []) + [URLQueryItem(name: name, value: value)]
     }
 
     /// Add a `URLQueryItem` with the given percent-encoded name and value to the `percentEncodedQueryItems` component.
     ///
     /// The `percentEncodedQueryItems` array is created if it is currently `nil`.
-    public mutating func appendPercentEncodedQueryItem(name: String, value: String? = nil) {
-        self.percentEncodedQueryItems = (self.percentEncodedQueryItems ?? []) + [.init(name: name, value: value)]
-    }
+//    public mutating func appendPercentEncodedQueryItem(name: String, value: String? = nil) {
+//        self.percentEncodedQueryItems = (self.percentEncodedQueryItems ?? []) + [URLQueryItem(name: name, value: value)]
+//    }
 }
 
 extension OneRosterAPI.Endpoint {
@@ -168,8 +168,8 @@ extension OneRosterAPI.Endpoint {
         if let offset = offset {
             components.appendQueryItem(name: "offset", value: "\(offset)")
         }
-        if let filterString = filterString {
-            components.appendPercentEncodedQueryItem(name: "filter", value: "\(filterString)")
+        if let filterString = filterString, let encoded = filterString.addingPercentEncoding(withAllowedCharacters: .alphanumerics) {
+            components.appendQueryItem(name: "filter", value: encoded)
         }
 
         guard var paramUrl = components.url else {