Add ESP8266 build to CI

.gitlab-ci.yml

@@ -4,6 +4,18 @@ stages:
   - build
   - test
 
+build_esp8266:
+  stage: build
+  before_script:
+  - export TOOLCHAIN_BASE=/opt/xtensa-lx106-elf/bin
+  - export SDK_BASE=/opt/xtensa-lx106-elf/xtensa-lx106-elf/sysroot/usr
+  script:
+  - curl -s https://ess.cs.uos.de/static/.gitlab-ci/xtensa-lx106-elf.tar.xz | tar -C /opt -xJf -
+  - mkdir -p build
+  - make -B arch=esp8266 app=donothing
+  - make -B arch=esp8266 app=ledblink loop=1 timer_s=1
+  - make -B arch=esp8266 app=sysinfo
+
 build_posix:
   stage: build
   script: