CI: replace gcc image with debian image

.drone.yml

@@ -1,10 +1,23 @@
 pipeline:
   gcc8:
-    image: gcc:8
+    image: debian:stretch-slim
     pull: true
+    environment:
+      - LANG=C.utf8
     commands:
+      - rm /etc/apt/apt.conf.d/docker-clean
       - apt-get update -q
-      - apt-get install -qy cmake libvsqlitepp-dev libboost-all-dev libxdg-basedir-dev qt5-default
+      - echo "APT::Default-Release \"stretch\";" >> /etc/apt/apt.conf.d/00default_release
+      - echo "deb http://ppa.launchpad.net/ubuntu-toolchain-r/test/ubuntu xenial main" >> /etc/apt/sources.list.d/ubuntu-toolchain-r.list
+      - apt-get install -qy gnupg
+      - gpg --keyserver hkp://keyserver.ubuntu.com --recv-keys 0x60c317803a41ba51845e371a1e9377a2ba9ef27f
+      - gpg --armor --export 0x60c317803a41ba51845e371a1e9377a2ba9ef27f | apt-key add -
+      - apt-get update -q
+      - apt-get install -qy build-essential cmake pkg-config
+      - apt-get install -qy -t xenial g++-8
+      - update-alternatives --install /usr/bin/g++ g++ /usr/bin/g++-8 100
+      - update-alternatives --set g++ /usr/bin/g++-8
+      - apt-get install -qy libvsqlitepp-dev libboost-all-dev libxdg-basedir-dev qt5-default
       - apt-get install -qy rpm file
       - rm -rf build && mkdir -p build && cd build
       - cmake ..
@@ -15,12 +28,28 @@ pipeline:
       - make package
       - cmake -DWITH_DEB=OFF -DWITH_RPM=ON ..
       - make package
+    volumes:
+      - /var/cache/debian-package-cache:/var/cache/apt/archives
+
   gcc7:
-    image: gcc:7
+    image: debian:stretch-slim
     pull: true
+    environment:
+      - LANG=C.utf8
     commands:
+      - rm /etc/apt/apt.conf.d/docker-clean
       - apt-get update -q
-      - apt-get install -qy cmake libvsqlitepp-dev libboost-all-dev libxdg-basedir-dev qt5-default
+      - echo "APT::Default-Release \"stretch\";" >> /etc/apt/apt.conf.d/00default_release
+      - echo "deb http://ppa.launchpad.net/ubuntu-toolchain-r/test/ubuntu xenial main" >> /etc/apt/sources.list.d/ubuntu-toolchain-r.list
+      - apt-get install -qy gnupg
+      - gpg --keyserver hkp://keyserver.ubuntu.com --recv-keys 0x60c317803a41ba51845e371a1e9377a2ba9ef27f
+      - gpg --armor --export 0x60c317803a41ba51845e371a1e9377a2ba9ef27f | apt-key add -
+      - apt-get update -q
+      - apt-get install -qy build-essential cmake pkg-config
+      - apt-get install -qy -t xenial g++-7
+      - update-alternatives --install /usr/bin/g++ g++ /usr/bin/g++-7 100
+      - update-alternatives --set g++ /usr/bin/g++-7
+      - apt-get install -qy libvsqlitepp-dev libboost-all-dev libxdg-basedir-dev qt5-default
       - apt-get install -qy rpm file
       - rm -rf build && mkdir -p build && cd build
       - cmake ..
@@ -31,17 +60,19 @@ pipeline:
       - make package
       - cmake -DWITH_DEB=OFF -DWITH_RPM=ON ..
       - make package
+    volumes:
+      - /var/cache/debian-package-cache:/var/cache/apt/archives
+
   gcc6:
-    image: gcc:6
+    image: debian:stretch-slim
     pull: true
+    environment:
+      - LANG=C.utf8
     commands:
-      - echo "deb http://deb.debian.org/debian jessie-backports main" >> /etc/apt/sources.list.d/backports.list
-      - echo "deb http://deb.debian.org/debian stretch main" >> /etc/apt/sources.list.d/stretch.list
-      - echo "APT::Default-Release \"jessie\";" >> /etc/apt/apt.conf.d/00default_release
+      - rm /etc/apt/apt.conf.d/docker-clean
       - apt-get update -q
-      - apt-get install -qy -t stretch libvsqlitepp-dev libboost-all-dev
-      - apt-get install -qy -t jessie-backports cmake
-      - apt-get install -qy libxdg-basedir-dev qt5-default
+      - apt-get install -qy build-essential cmake pkg-config
+      - apt-get install -qy libvsqlitepp-dev libboost-all-dev libxdg-basedir-dev qt5-default
       - apt-get install -qy rpm file
       - rm -rf build && mkdir -p build && cd build
       - cmake ..
@@ -52,8 +83,12 @@ pipeline:
       - make package
       - cmake -DWITH_DEB=OFF -DWITH_RPM=ON ..
       - make package
+    volumes:
+      - /var/cache/debian-package-cache:/var/cache/apt/archives
+
+
   prepare_release:
-    image: gcc:6
+    image: debian:stretch-slim
     pull: true
     when:
       event: tag
@@ -61,6 +96,7 @@ pipeline:
       - cp -v build/whyblocked-${DRONE_TAG}_x86_64.tar.gz .
       - cp -v build/whyblocked_${DRONE_TAG}-0_amd64.deb .
       - cp -v build/whyblocked-${DRONE_TAG}-0.x86_64.rpm .
+
   gitea_release:
     image: plugins/gitea-release
     pull: true
@@ -77,6 +113,7 @@ pipeline:
     checksum:
       - sha256
       - sha512
+
   notify:
     image: drillster/drone-email
     pull: true