[pkg] fix Dockerfile install

docker/Dockerfile

@@ -12,18 +12,18 @@ RUN apt-get update && apt-get upgrade -y && \
             build-essential \
             make cmake \
             git curl wget \
-            golang libappindicator3-dev libgtk-3-dev \
+            libappindicator3-dev libgtk-3-dev \
             mingw-w64 upx-ucl python snapcraft \
             unzip \
             devscripts fakeroot debhelper nsis \
             clang llvm-dev libxml2-dev uuid-dev \
             libssl-dev bash patch tar \
             xz-utils bzip2 gzip sed cpio libbz2-dev && \
-    apt-get install software-properties-common && \
-    add-apt-repository ppa:longsleep/golang-backports && \
+    apt-get install -y software-properties-common && \
+    add-apt-repository -y ppa:longsleep/golang-backports && \
     apt-get update && \
     apt-get install -y --no-install-recommends \
-            dh-golang golang-golang-x-text-dev
+            dh-golang golang golang-golang-x-text-dev
 
 RUN git clone https://github.com/tpoechtrager/osxcross && \
     cd osxcross/tarballs && \