Allow specifying CI lib dependencies for each example

Author: fhessel

examples/REST-API/.ci_lib_deps

@@ -0,0 +1 @@
+ArduinoJson=5.13.4

extras/ci/scripts/build-examples.sh

@@ -74,6 +74,12 @@ for EXAMPLE in "$EXAMPLEDIR"/*; do
       echo "#include <Arduino.h>" > "$MAINCPP"
       cat "$INOFILE" >> "$MAINCPP"
       rm "$INOFILE"
+      # If the example has dependencies, rewrite platformio.ini
+      if [[ -f "$EXAMPLEDIR/$EXAMPLENAME/.ci_lib_deps" ]]; then
+        LIB_DEPS=$(head -n1 "$EXAMPLEDIR/$EXAMPLENAME/.ci_lib_deps")
+        sed "s#\\#lib_deps#lib_deps = $LIB_DEPS#" "$PROJECTDIR/platformio.ini" > "$PROJECTDIR/platformio.ini.tmp"
+        mv "$PROJECTDIR/platformio.ini.tmp" "$PROJECTDIR/platformio.ini"
+      fi
       # Try building the application (+e as we want to test every example and get a
       # summary on what is working)
       set +e

extras/ci/templates/example-project/platformio.ini

@@ -5,6 +5,7 @@ default_envs = wrover, wroom
 platform = espressif32
 board = esp32dev
 framework = arduino
+#lib_deps # do not remove, the build script uses this as marker to insert example-specific dependencies
 
 [env:wrover]
 board_build.partitions = partitions_wrover.csv