ci: use ephemeral packages when building the build-base image

v2:
  - Update tag for the android_build image (Michel).

Signed-off-by: Andres Gomez <agomez@igalia.com>
Reviewed-by: Christian Gmeiner <christian.gmeiner@gmail.com> [v1]
Reviewed-by: Tomeu Vizoso <tomeu.vizoso@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/6388>

.gitlab-ci.yml

@@ -259,7 +259,7 @@ x86_build-base:
     - .fdo.container-build@debian
     - .container
   variables:
-    MESA_IMAGE_TAG: &x86_build-base "2020-12-09-sanitizers"
+    MESA_IMAGE_TAG: &x86_build-base "2020-12-17-use-ephemeral"
 
 .use-x86_build-base:
   extends:
@@ -276,7 +276,7 @@ x86_build:
   extends:
     - .use-x86_build-base
   variables:
-    MESA_IMAGE_TAG: &x86_build "2020-12-16-cmake"
+    MESA_IMAGE_TAG: &x86_build "2020-12-17-use-ephemeral"
 
 .use-x86_build:
   variables:
@@ -290,7 +290,7 @@ i386_build:
   extends:
     - .use-x86_build-base
   variables:
-    MESA_IMAGE_TAG: &i386_build "2020-12-09-sanitizers"
+    MESA_IMAGE_TAG: &i386_build "2020-12-17-use-ephemeral"
 
 .use-i386_build:
   variables:
@@ -304,7 +304,7 @@ ppc64el_build:
   extends:
     - .use-x86_build-base
   variables:
-    MESA_IMAGE_TAG: &ppc64el_build "2020-12-09-sanitizers"
+    MESA_IMAGE_TAG: &ppc64el_build "2020-12-17-use-ephemeral"
 
 .use-ppc64el_build:
   variables:
@@ -318,7 +318,7 @@ s390x_build:
   extends:
     - .use-x86_build-base
   variables:
-    MESA_IMAGE_TAG: &s390x_build "2020-12-09-sanitizers"
+    MESA_IMAGE_TAG: &s390x_build "2020-12-17-use-ephemeral"
 
 .use-s390x_build:
   variables:
@@ -332,7 +332,7 @@ android_build:
   extends:
     - .use-x86_build-base
   variables:
-    MESA_IMAGE_TAG: &android_build "2020-12-09-sanitizers"
+    MESA_IMAGE_TAG: &android_build "2020-12-17-use-ephemeral"
 
 .use-android_build:
   variables:

.gitlab-ci/container/x86_build-base.sh

@@ -7,11 +7,7 @@ export DEBIAN_FRONTEND=noninteractive
 
 apt-get install -y \
         ca-certificates \
-        gnupg \
-        python3-pip \
-        python3-setuptools \
-        unzip \
-        wget
+        gnupg
 
 # Upstream LLVM package repository
 apt-key add .gitlab-ci/container/llvm-snapshot.gpg.key
@@ -21,6 +17,14 @@ echo "deb https://apt.llvm.org/buster/ llvm-toolchain-buster-10 main" >/etc/apt/
 sed -i -e 's/http:\/\/deb/https:\/\/deb/g' /etc/apt/sources.list
 echo 'deb https://deb.debian.org/debian buster-backports main' >/etc/apt/sources.list.d/backports.list
 
+# Ephemeral packages (installed for this script and removed again at
+# the end)
+STABLE_EPHEMERAL=" \
+        python3-pip \
+        python3-setuptools \
+        unzip \
+        "
+
 apt-get update
 
 apt-get install -y --no-remove \
@@ -64,12 +68,11 @@ apt-get install -y --no-remove \
         python-mako \
         python3-mako \
         python3-pil \
-        python3-pip \
         python3-requests \
-        python3-setuptools \
         qemu-user \
         scons \
         valgrind \
+        wget \
         wine64-development \
         x11proto-dri2-dev \
         x11proto-gl-dev \
@@ -95,7 +98,7 @@ rm bin/glslangValidator glslang-master-linux-Release.zip
 ############### Uninstall ephemeral packages
 
 apt-get purge -y \
-        gnupg \
-        unzip
+        $STABLE_EPHEMERAL \
+        gnupg
 
 . .gitlab-ci/container/container_post_build.sh