Previously, it was necessary to support older versions of Python for
compatibility. F-strings were released in Python 3.6. Python 3.5 was
marked as unsupported by the end of 2020, so now it's possible to start
using f-strings safely for better readability and performance.
Added "go" availability check before trying to build an application.
update_action() method used were possible and fixed bug with
the relative path determination in test_static_chroot.py.
Templates optimization and style fixes.
In Go 1.16, the module-aware mode is enabled by default; to fall back to
previous behavior, the GO111MODULE environment variable should be set to
'auto'.
Details: https://golang.org/doc/go1.16
The Go compiler can't detect changes to C header files when
compiling CGO applications, and then this leads to Go test
samples being linked with wrong libunit.
This patch creates a new cache directory reused throughout
the test suite.
