### What needs to get done Share variables such as `SNAPCRAFT_PROJECT_DIR`, `SNAPCRAFT_PROJECT_VERSION` and `CRAFT_ARCH_BUILD_FOR` with the testing environment. ### Why it needs to get done This allows test projects to correctly identify the snap generated in this lifecycle run by referencing them as `$SNAPCRAFT_PROJECT_DIR/mysnap_$SNAPCRAFT_PROJECT_VERSION_$CRAFT_ARCH_BUILD_FOR.snap`. Other variables containing component versions can be exported later.