Drop calls to apt

New flatdeb-builder docker image already embed packages request to build
and upload the Flatpak runtime and apps.

Signed-off-by: Frédéric Danis <frederic.danis@collabora.com>

.gitlab-ci.yml

@@ -19,6 +19,8 @@ stages:
 .build:
   variables:
     GIT_STRATEGY: clone
+  before_script:
+    - chmod 0400 "$ARCHIVE_SECRET_FILE"
   rules:
     - if: $CI_MERGE_REQUEST_ID
       when: never
@@ -30,9 +32,6 @@ build-base:
   extends:
     - .build
   stage: build base
-  before_script:
-    - apt update
-    - apt install -y binutils debootstrap debos flatpak ostree pigz python3 python3-debian python3-gi python3-yaml systemd-container time flatpak-builder
   script:
     - /opt/apertis-flatdeb/run.py --build-area=$(pwd)/flatdeb-builddir --ostree-repo=$(pwd)/flatdeb-builddir/ostree-repo --suite=${APERTIS_RELEASE} --arch=amd64 base
   artifacts:
@@ -43,10 +42,6 @@ build-platform-runtime:
   extends:
     - .build
   stage: build runtime
-  before_script:
-    - apt update
-    - apt install -y binutils debootstrap debos flatpak ostree pigz python3 python3-debian python3-gi python3-yaml systemd-container time flatpak-builder
-    - chmod 0400 "$ARCHIVE_SECRET_FILE"
   script:
     - /opt/apertis-flatdeb/run.py --build-area=$(pwd)/flatdeb-builddir --ostree-repo=$(pwd)/flatdeb-builddir/ostree-repo --suite=${APERTIS_RELEASE} --arch=amd64 --platform runtimes runtimes/org.apertis.demo.yaml
     - |
@@ -66,10 +61,6 @@ build-sdk-runtime:
   extends:
     - .build
   stage: build runtime
-  before_script:
-    - apt update
-    - apt install -y binutils debootstrap debos flatpak ostree pigz python3 python3-debian python3-gi python3-yaml systemd-container time flatpak-builder
-    - chmod 0400 "$ARCHIVE_SECRET_FILE"
   script:
     - /opt/apertis-flatdeb/run.py --build-area=$(pwd)/flatdeb-builddir --ostree-repo=$(pwd)/flatdeb-builddir/ostree-repo --suite=${APERTIS_RELEASE} --arch=amd64 --sdk runtimes runtimes/org.apertis.demo.yaml
     - |
@@ -89,10 +80,6 @@ build-app:
   extends:
     - .build
   stage: build app
-  before_script:
-    - apt update
-    - apt install -y binutils debootstrap debos flatpak ostree pigz python3 python3-debian python3-gi python3-yaml systemd-container time flatpak-builder
-    - chmod 0400 "$ARCHIVE_SECRET_FILE"
   script:
     - |
       case "$CI_COMMIT_REF_NAME" in