updated libgnutls because of gpg key errors in jenkins

Signed-off-by: pSchlarb <[email protected]>

Author: pSchlarb

devops/ext/docker/base/xenial/Dockerfile.0.3.0

@@ -28,6 +28,7 @@ RUN apt-get update && apt-get install -y --no-install-recommends \
         ruby-dev \
         rubygems \
     && gem install --no-ri --no-rdoc fpm -v $FPM_VERSION \
+    && apt --only-upgrade install -y libgnutls30 \
     && rm -rf /var/lib/apt/lists/*
 
 
@@ -38,7 +39,7 @@ RUN set -x \
 	&& wget -O /usr/local/bin/gosu "https://github.com/tianon/gosu/releases/download/$GOSU_VERSION/gosu-$(dpkg --print-architecture)" \
 	&& wget -O /usr/local/bin/gosu.asc "https://github.com/tianon/gosu/releases/download/$GOSU_VERSION/gosu-$(dpkg --print-architecture).asc" \
 	&& export GNUPGHOME="$(mktemp -d)" \
-	&& gpg --keyserver ha.pool.sks-keyservers.net --recv-keys B42F6819007F00F88E364FD4036A9C25BF357DD4 \
+	&& gpg --batch --keyserver hkps://keys.openpgp.org --recv-keys B42F6819007F00F88E364FD4036A9C25BF357DD4 \
 	&& gpg --batch --verify /usr/local/bin/gosu.asc /usr/local/bin/gosu \
 	&& rm -rf "$GNUPGHOME" /usr/local/bin/gosu.asc \
 	&& chmod +x /usr/local/bin/gosu \