Add CI

.gitlab-ci.yml

+build:
+  image: europeanxfel/karabo-ci:ubuntu-22-003
+  script:
+    # Set up Arduino environment
+    - cat /etc/os-release
+    - apt-get install -y wget python3-pip
+    - wget -nv
+      https://downloads.arduino.cc/arduino-cli/arduino-cli_latest_Linux_64bit.tar.gz
+    - tar -xf arduino-cli_latest_Linux_64bit.tar.gz
+    - mv arduino-cli /usr/bin/arduino-cli
+
+    # Configure arduino-cli
+    - echo "board_manager:" > arduino-cli.yaml
+    - echo "  additional_urls:" >> arduino-cli.yaml
+    - echo "    - https://dl.espressif.com/dl/package_esp32_index.json" >> arduino-cli.yaml
+    - echo "library:" >> arduino-cli.yaml
+    - echo -n "  enable_unsafe_install:" >> arduino-cli.yaml
+    - echo " true" >> arduino-cli.yaml
+    - cat -E arduino-cli.yaml
+
+    # Set up esp32 support
+    - arduino-cli core update-index --config-file arduino-cli.yaml
+    - arduino-cli core install esp32:esp32
+
+    # Add pyserial for esp32 to chooch
+    - pip3 install pyserial
+
+    # Install dependencies
+    - arduino-cli lib install Ethernet
+    - arduino-cli lib install --git-url https://github.com/patricklaf/SNMP.git --config-file arduino-cli.yaml
+
+    # Compile artifact
+    - arduino-cli compile --fqbn esp32:esp32:esp32wroverkit icbm.ino --output-dir firmware
+    - zip -r firmware.zip firmware
+  artifacts:
+    when: always
+    paths:
+      - firmware.zip
+    expire_in: 1 week
+  interruptible: true