fix: force curl to fail on error (#49)

Dockerfile

@@ -26,8 +26,8 @@ ADD overlay/ /
 RUN addgroup --gid 101 --system mongodb && \
     adduser --system --disabled-password --no-create-home --uid 101 --home "${MONGO_DATA_DIR}" --shell /sbin/nologin --ingroup mongodb --gecos mongodb mongodb && \
     apt-get update && apt-get install -y wget curl gnupg2 procps apt-transport-https ca-certificates && \
-    curl -SsL -o /usr/local/bin/gomplate "https://github.com/hairyhenderson/gomplate/releases/download/${GOMPLATE_VERSION}/gomplate_linux-amd64-slim" && \
-    curl -SsL "https://github.com/owncloud-ops/container-library/releases/download/${CONTAINER_LIBRARY_VERSION}/container-library.tar.gz" | tar xz -C / && \
+    curl -SsfL -o /usr/local/bin/gomplate "https://github.com/hairyhenderson/gomplate/releases/download/${GOMPLATE_VERSION}/gomplate_linux-amd64-slim" && \
+    curl -SsfL "https://github.com/owncloud-ops/container-library/releases/download/${CONTAINER_LIBRARY_VERSION}/container-library.tar.gz" | tar xz -C / && \
     chmod 755 /usr/local/bin/gomplate && \
     MONGO_VERSION=${MONGO_RAW_VERSION%.*} && \
     echo "Setup MongoDB 'v$MONGO_VERSION'" && \