Add GitHub actions CI workflow to build, run and test the app

.github/workflows/ci.yml

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+name: cos316-test-ci
+
+on:
+  push: # Run CI for push operations on all branches
+
+jobs:
+  ci-build:
+    # Our CI build action will run on a Ubuntu virtual machine
+    runs-on: ubuntu-latest
+
+    steps:
+      # Makes sure that our repository is available
+      #
+      # All further actions will run from within this repository
+      - uses: actions/checkout@v3
+
+      # Simply build and run our program for now. This will
+      # automatically fail the CI if the build or run operations fail
+      # (return with a non-zero error code).
+      - name: build
+        run: go build main.go
+
+      # Execute our program. It should run without returning an
+      # error-code.
+      - name: run
+        run: ./cos316test
+
+      # Run any tests defined in the go source code:
+      - name: test
+        run: go test ./...

utils/assignments_test.go

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+package utils
+
+import (
+	"testing"
+	"math/rand"
+	"time"
+)
+
+// https://stackoverflow.com/a/43497333, CC BY-SA 3.0 @mkopriva
+func randdate() time.Time {
+    min := time.Date(1970, 1, 0, 0, 0, 0, 0, time.UTC).Unix()
+    max := time.Date(2070, 1, 0, 0, 0, 0, 0, time.UTC).Unix()
+    delta := max - min
+
+    sec := rand.Int63n(delta) + min
+    return time.Unix(sec, 0)
+}
+
+func TestAssignmentDueToday(t *testing.T) {
+	for i := 0; i < 1000; i++ {
+		// Generate a random date. If its a Wednesday,
+		// an assignment should be due...
+		date := randdate()
+
+		if (date.Weekday() == time.Wednesday) != AssignmentDueToday(date) {
+			t.Errorf("Assignment should be due on %s!", date);
+		}
+	}
+}
+