ci: add initial build pipeline

.gitlab-ci.yml

+default:
+  image: registry.fedoraproject.org/fedora-minimal:latest
+
+stages:
+  - build
+  - test
+  - trigger
+
+build:lib:
+  stage: build
+  tags:
+    - docker
+  script:
+    - microdnf --nodocs install cmake gcc gcc-c++
+    - cmake . -Bbuild
+    - cmake --build build
+  artifacts:
+    paths:
+      - build/
+
+test:lib:
+  stage: test
+  tags:
+    - docker
+  needs:
+    - build:lib
+  script:
+    - microdnf --nodocs install cmake
+    - pushd build/tests
+    - ctest .
+
+trigger:android:
+  stage: trigger
+  trigger:
+    strategy: depend
+    include: android/.gitlab-ci.yml
+
+trigger:javascript:
+  stage: trigger
+  trigger:
+    strategy: depend
+    include: javascript/.gitlab-ci.yml
+
+trigger:python:
+  stage: trigger
+  trigger:
+    strategy: depend
+    include: python/.gitlab-ci.yml

android/.gitlab-ci.yml

+# TODO: consider replacing this with a smaller image
+image: docker.io/inovex/gitlab-ci-android
+
+stages:
+  - build
+  - test
+
+variables:
+  GRADLE_OPTS: "-Dorg.gradle.daemon=false"
+
+before_script:
+  - export GRADLE_USER_HOME=$(pwd)/.gradle
+  - export ANDROID_HOME=${ANDORID_SDK_HOME}
+  - echo "sdk.dir=${ANDROID_SDK_HOME}" > ./android/local.properties
+  - echo "ndk.dir=${ANDROID_NDK_HOME}" >> ./android/local.properties
+  - cp -R $ANDROID_SDK_ROOT/licenses ./android/.
+  - chmod +x ./android/gradlew
+
+cache:
+  key: ${CI_PROJECT_ID}
+  paths:
+    - android/.gradle/
+
+build:android:aar:
+  stage: build
+  tags:
+    - docker
+  script:
+    - pushd android
+    - ./gradlew clean assembleRelease
+  artifacts:
+    expire_in: 1 weeks
+    paths:
+      - android/olm-sdk/build/outputs/aar/*.aar
+      - android/local.properties
+
+test:android:aar:
+  stage: test
+  tags:
+    - docker
+  script:
+    - pushd android
+    # TODO: fix this?
+    # - ./gradlew test
+  needs:
+    - build:android:aar

javascript/.gitlab-ci.yml

+default:
+  image: docker.io/emscripten/emsdk:latest
+
+stages:
+  - build
+  - test
+
+build:js:
+  stage: build
+  script:
+    - ln -sf $(which python3) /usr/local/bin/python
+    - make js
+  artifacts:
+    paths:
+      - build/javascript
+      - javascript/olm.js
+      - javascript/olm.wasm
+      - javascript/exported_functions.json
+
+test:js:
+  stage: test
+  needs:
+    - build:js
+  script:
+    - pushd javascript
+    - npm i
+    - npm run test

python/.gitlab-ci.yml

+variables:
+  PIP_CACHE_DIR: "$CI_PROJECT_DIR/.cache/pip"
+  LD_LIBRARY_PATH: "$CI_PROJECT_DIR/build"
+  DEFAULT_PYTHON: "3.9"
+
+cache:
+  paths:
+    - .cache/pip
+
+stages:
+  - build
+  - test
+  - dist
+
+before_script:
+  - pushd python
+  - pip --disable-pip-version-check install --upgrade pip
+
+build:python:
+  stage: build
+  image: docker.io/python:$DEFAULT_PYTHON
+  cache: { }
+  before_script: [ ]
+  script:
+    - apt-get -y update && apt-get -y install cmake
+    - cmake . -Bbuild
+    - cmake --build build
+  artifacts:
+    paths:
+      - build
+
+test:python:
+  stage: test
+  image: docker.io/python:$PYTHON_VERSIONS
+  parallel:
+    matrix:
+      - PYTHON_VERSIONS: [ "3.6", "3.7", "3.8", "3.9" ]
+  script:
+    - pip install tox
+    - make headers
+    - tox -e py
+  dependencies:
+    - build:python
+  artifacts:
+    paths:
+      - python/.coverage
+      - python/coverage.xml
+
+dist:python:sdist:
+  stage: dist
+  image: docker.io/python:$DEFAULT_PYTHON
+  script:
+    - pip install build
+    - python -m build --sdist
+  dependencies: [ ]
+  artifacts:
+    paths:
+      - python/build/**
+      - python/dist/*.tar.gz
+
+dist:python:wheel:
+  stage: dist
+  image: docker.io/python:$PYTHON_VERSIONS
+  parallel:
+    matrix:
+      - PYTHON_VERSIONS: [ "3.6", "3.7", "3.8", "3.9" ]
+  script:
+    - pip install build
+    - python -m build --wheel
+  dependencies:
+    - build:python
+  artifacts:
+    paths:
+      - python/build/**
+      - python/dist/*.whl