Dockerfile: Added tzdata package to final container.

Dockerfile

@@ -28,8 +28,8 @@ RUN go build -a -installsuffix cgo -ldflags="-s -w" -o /binaries/rpdata-logpaste
 # Use alpine linux
 FROM alpine:3.7
 
-# Install certificates to enable HTTPS GET requests
-RUN apk add --no-cache ca-certificates
+# Install certificates to enable HTTPS GET requests, and tzdata for logpaste
+RUN apk add --no-cache ca-certificates tzdata
 
 # Copy build files into final container
 COPY --from=build-server /binaries/* /usr/local/bin/