Add CI for debug PR builds

Add a debug and test CI. As the test coverage today is not much to get excited about, this is mostly a check that the app still builds, as well as a convenient way to download the prebuilt app for testing.

.gitlab-ci.yml

@@ -0,0 +1,66 @@
+# SPDX-FileCopyrightText: 2023 Nicolas Fella <nicolas.fella@gmx.de>
+# SPDX-FileCopyrightText: 2023 Simon Redman <simon@ergotech.com>
+# SPDX-License-Identifier: GPL-2.0-only OR GPL-3.0-only OR LicenseRef-KDE-Accepted-GPL
+#
+# Test this pipeline locally by:
+# - Set up Docker on your machine, if not already set up
+# - Set up gitlab-runner, as described here: https://stackoverflow.com/a/52724374
+# - Run `gitlab-runner exec docker --docker-privileged assembleDebug`
+
+image: openjdk:11-jdk
+
+variables:
+  ANDROID_COMPILE_SDK: "31"
+  ANDROID_BUILD_TOOLS: "30.0.3"
+  ANDROID_SDK_TOOLS:   "6609375"
+
+before_script:
+  - apt-get --quiet update --yes
+  - apt-get --quiet install --yes wget tar unzip lib32stdc++6 lib32z1
+  - wget --quiet --output-document=android-sdk.zip https://dl.google.com/android/repository/commandlinetools-linux-6609375_latest.zip
+  - unzip -d cmdline-tools android-sdk.zip
+  - echo y | cmdline-tools/tools/bin/sdkmanager "platforms;android-${ANDROID_COMPILE_SDK}" >/dev/null
+  - echo y | cmdline-tools/tools/bin/sdkmanager "platform-tools" >/dev/null
+  - echo y | cmdline-tools/tools/bin/sdkmanager "patcher;v4" >/dev/null
+  - echo y | cmdline-tools/tools/bin/sdkmanager "emulator" >/dev/null
+  - echo y | cmdline-tools/tools/bin/sdkmanager "platform-tools" >/dev/null
+  - echo y | cmdline-tools/tools/bin/sdkmanager "tools" >/dev/null
+  - echo y | cmdline-tools/tools/bin/sdkmanager "build-tools;${ANDROID_BUILD_TOOLS}" >/dev/null
+  - export ANDROID_HOME=$PWD/cmdline-tools
+  - export PATH=$PATH:$PWD/cmdline-tools/platform-tools/
+  - chmod +x ./gradlew
+  # temporarily disable checking for EPIPE error and use yes to accept all licenses
+  - set +o pipefail
+  - yes | cmdline-tools/tools/bin/sdkmanager --licenses
+    # Gradle will automatically download parts of the SDK if they are missing,
+    # assuming the licenses are accepted. Even if you don't need it to download
+    # anything, it will fail if it detects the liceses are not accepted.
+    # https://developer.android.com/studio/intro/update.html#download-with-gradle
+    # Unfortunately, it looks for the license acceptances in a different location than
+    # the sdkmanager creates them!
+    # Copy them to the location Gradle expects to find them to make everything run smoothly.
+  - cp -ap "${PWD}/licenses" "${PWD}/cmdline-tools/licenses"
+  - set -o pipefail
+
+stages:
+  - build
+  - test
+
+lintDebug:
+  stage: build
+  script:
+    - ./gradlew generateLicenseReport
+    - ./gradlew -Pci --console=plain lintDebug -PbuildDir=lint
+
+assembleDebug:
+  stage: build
+  script:
+    - ./gradlew assembleDebug
+  artifacts:
+    paths:
+    - build/outputs/
+
+debugTests:
+  stage: test
+  script:
+    - ./gradlew -Pci --console=plain testDebug