You did a shallow copy of the git repo:
The solution is to ensure that the initial clone of the repo in the build environment was not a shallow clone (i.e. the git clone command was not used with --depth, --shallow-since or --shallow-exclude parameters).
so change your
git clone --recursive --depth 1 https://github.com/esp8266/Arduino.git esp8266
....
git clone --recursive --depth 1 https://github.com/pfalcon/esp-open-sdk.git
to
git clone --recursive https://github.com/esp8266/Arduino.git esp8266
....
git clone --recursive https://github.com/pfalcon/esp-open-sdk.git
and make sure your *.ino contains at least
setup(){}
AND
loop(){}