Update CI_HOME to use home directory.
Current output for CI_HOME:
```
$ echo ~ci
~ci
```
Expected output for CI_HOME:
```
$ echo ~/ci
/root/ci
```
# Setup the required file structure in the ci's home directory
-CI_HOME="$(echo ~ci)"
+CI_HOME="$(echo ~/ci)"
PLATFORM="$(uname -s | tr '[:upper:]' '[:lower:]')-$(uname -m)"
BAZEL_VERSION="$(pkg query '%v' bazel)"
destination="${CI_HOME}/.bazel/${BAZEL_VERSION}"
