The SNAPCRAFT_BUILD_ENVIRONMENT environment variable
Handle the chosen build provider.
To determine the build environment, SNAPCRAFT_BUILD_ENVIRONMENT is retrieved from the environment and used to determine the build provider. An environment can be forced by use of force_provider during initialization. The default environment is multipass unless the snapcraft is run inside docker for which the preferred environment will be to use the host.
Valid values are:
host: the host will drive the build.
managed-host: the host will drive the build, but work best for discardable build providers.
multipass: a vm driven by multipass will be created to drive the build.
Previously the value lxd is supported but was dropped in Snapcraft 3.0, as a workaround you can create an LXD container manually and set the SNAPCRAFT_BUILD_ENVIRONMENT environment variable to host in the container.