some fixes

.ci/travis/linux/before_script.sh

@@ -20,7 +20,7 @@ pushd .docker
 docker --version
 #docker pull ubuntu:16.04
 docker pull "qgis/qgis3-build-deps:${DOCKER_TAG}" || true
-docker build --file deps-Dockerfile \
+docker build --file Dockerfile-deps \
              --cache-from "qgis/qgis3-build-deps:${DOCKER_TAG}"\
              --tag "qgis/qgis3-build-deps:${DOCKER_TAG}" .
 # image should be pushed even if QGIS build fails

.docker/Dockerfile-build-test

@@ -0,0 +1,10 @@
+
+ARG DOCKER_TAG=latest
+
+FROM      qgis/qgis3-build-deps:$DOCKER_TAG
+MAINTAINER Denis Rouzaud <denis.rouzaud@gmail.com>
+
+RUN ls /root/.ccache
+
+RUN echo "DDDD"
+RUN /root/QGIS/.ci/travis/linux/docker-build-test.sh

.docker/deps-Dockerfile → .docker/Dockerfile-deps

@@ -1,5 +1,4 @@
 
-
 FROM      ubuntu:16.04
 MAINTAINER Denis Rouzaud <denis.rouzaud@gmail.com>
 
@@ -20,6 +19,7 @@ RUN  apt-get update \
     dh-python \
     flex \
     gdal-bin \
+    git \
     graphviz \
     grass-dev \
     libexpat1-dev \
@@ -102,5 +102,3 @@ ENV QT_SELECT=5
 # RUN cmake --version
 # RUN ${CC} --version
 # RUN ${CXX} --version
-
-RUN apt-get install -y git

.docker/docker-compose.travis.yml

@@ -8,7 +8,9 @@ services:
   qgis-build-and-test:
     build:
       context: .
-      dockerfile: build-Dockerfile
+      dockerfile: Dockerfile-build-test
+      args:
+        DOCKER_TAG: ${DOCKER_TAG}
     tty: true
     image: qgis/qgis3-run:${DOCKER_TAG}
     volumes: