fix(examples): Define the CI build in rules

Author: david-cermak

.github/workflows/examples_build-host-test.yml

@@ -59,10 +59,12 @@ jobs:
       - name: Build with IDF-${{ matrix.idf_ver }}
         shell: bash
         run: |
-          ./ci/config_env.sh
+          . ${GITHUB_WORKSPACE}/ci/config_env.sh
           . ${IDF_PATH}/export.sh
           python -m pip install idf-build-apps
-          python ./ci/build_apps.py examples/mqtt -l -t linux -r default
+          env | grep -i broker
+          python ./ci/build_apps.py examples/mqtt -l -t linux -r 'sdkconfig.ci'
+          cat examples/mqtt/build_linux/config/sdkconfig.h | grep -i broker
           timeout 5 ./examples/mqtt/build_linux/esp_mqtt_demo.elf | tee test.log  || true
           grep 'MQTT_EVENT_DATA' test.log
 

ci/config_env.sh

@@ -4,4 +4,4 @@
 set -e
 
 # MQTT public broker URI
-echo "CI_MQTT_BROKER_URI=\"broker.emqx.io\"" >> "$GITHUB_ENV"
+export CI_MQTT_BROKER_URI="broker.emqx.io"

examples/mqtt/sdkconfig.ci

@@ -0,0 +1,2 @@
+# CONFIG_ESP_EVENT_POST_FROM_ISR is not set
+CONFIG_BROKER_URL="mqtt://${CI_MQTT_BROKER_URI}"