Restore tests

Signed-off-by: Matt Ray <github@mattray.dev>

Dockerfile

@@ -20,6 +20,8 @@ RUN go mod download
 COPY . .
 # Build the binary
 RUN set -e ;\
+    go test ./test/*.go;\
+    go test ./pkg/*;\
     cd cmd/costmodel;\
     GOOS=linux \
     go build -a -installsuffix cgo \