fix(ci): pass BUILD_VERSION as string to avoid float formatting issue

[andreasbrett]

BUILD_VERSION was interpreted as a float instead of a string when injected via CI build flags before.

This caused values like 1.1 to be treated as a floating-point literal (1.1) rather than a string ("1.1"). When converted using String(BUILD_VERSION), this then resulted in incorrect version formatting (e.g. "1.10"). It's used in getFirmwareMajor and getFirmwareMinor.

Firmware/src/main.cpp

Lines 573 to 580 in b04a22b

	uint8_t getFirmwareMajor(){
	String version = String(BUILD_VERSION);
	int dotIndex = version.indexOf('.');
	if (dotIndex > 0) {
	return version.substring(0, dotIndex).toInt();
	}
	return 0;
	}

Firmware/src/main.cpp

Lines 582 to 589 in b04a22b

	uint8_t getFirmwareMinor(){
	String version = String(BUILD_VERSION);
	int dotIndex = version.indexOf('.');
	if (dotIndex > 0 && dotIndex < (int)(version.length() - 1)) {
	return version.substring(dotIndex + 1).toInt();
	}
	return 0;
	}

[jonasniesner]

Thank you for your PR