changes:
- Stops scripts/generate-keystore.sh runnig for every new TARGET=android shell
- Moves running scripts/generate-keystore.sh to keystore Makefile target
- Makes generate-keystore.sh accept STATUS_RELEASE_STORE_FILE as env variable
- Fixes error about missing lsof from start-react-native.sh
- Fixes error about unknown -keystore command in scripts/generate-keystore.sh
- Fixes getting OS_NAME without calling Nix shell
- Fixes getting TMP_BUILD_NUMBER without calling Nix shell
- Adds lsof used in start-react-native.sh to Android release Nix derivation
- Simplified how nix/scripts/build.sh appends the --keep flag
- Made use of colors.sh in more scripts
Signed-off-by: Jakub Sokołowski <jakub@status.im>