ci: Use images from funkwhale/ci instead of building one ourself

.gitlab-ci.yml

@@ -1,4 +1,5 @@
-image: $CI_REGISTRY/funkwhale/funkwhale-android:latest
+# This image lives in https://dev.funkwhale.audio/funkwhale/ci
+image: $CI_REGISTRY/funkwhale/ci/android:latest
 
 variables:
   COBERTURA_REPORT: '$CI_PROJECT_DIR/app/build/reports/cobertura.xml'
@@ -12,26 +13,6 @@ stages:
   - build
   - deploy
 
-build_ci_image:
-  stage: build_ci_env
-  image: egon0/docker-with-buildx-and-git:bash
-  tags:
-    - dind
-  services:
-    - docker:20-dind
-  before_script:
-    - docker login -u $CI_REGISTRY_USER -p $CI_REGISTRY_PASSWORD $CI_REGISTRY
-  script:
-    - docker build -t $CI_REGISTRY_IMAGE docker
-  after_script:
-    - docker push $CI_REGISTRY_IMAGE
-  rules:
-    - if: '$BUILD_CI_IMAGE'
-  variables:
-    DOCKER_HOST: tcp://docker:2375/
-    DOCKER_DRIVER: overlay2
-    DOCKER_TLS_CERTDIR: ""
-
 cache: &global_cache
   key: ${CI_PIPELINE_ID}
   paths:

docker/Dockerfile

@@ -1,17 +0,0 @@
-FROM debian:stable-slim
-
-ENV ANDROID_COMPILE_SDK=33
-ENV SDK_TOOLS_VERSION=32.0.0
-ENV ANDROID_CMD_TOOLS=9123335
-ENV ANDROID_HOME=/opt/android-sdk-linux
-ENV PATH "/opt/android-sdk-linux/cmdline-tools/bin:${PATH}"
-
-RUN apt-get update && apt-get install --yes openjdk-11-jdk wget tar unzip lib32stdc++6 lib32z1 git
-RUN mkdir -p /opt/android-sdk-linux && cd /opt \
-      && wget -q https://dl.google.com/android/repository/commandlinetools-linux-${ANDROID_CMD_TOOLS}_latest.zip -O android-sdk-tools.zip \
-      && unzip -q android-sdk-tools.zip -d ${ANDROID_HOME} \
-      && rm -f android-sdk-tools.zip \
-      && echo y | sdkmanager --sdk_root=${ANDROID_HOME} "platforms;android-${ANDROID_COMPILE_SDK}" \
-      && echo y | sdkmanager --sdk_root=${ANDROID_HOME} "platform-tools" \
-      && echo y | sdkmanager --sdk_root=${ANDROID_HOME} "build-tools;${SDK_TOOLS_VERSION}"
-