* Removes `+` symbol accidently left in (this broke building).
* Removes `ARG` thus making the Docker exclusively for clang-16.
* Adds "llvm.sh" to the repo. This stops us being dependent on the url
download. The script is under the apache license therefore compatible.
* Merges several `apt install` commands into one.
Change-Id: Iaf411656aac83f67f5395b20efd96ecc1eabb263
This updates the dockerfiles for ubuntu 22.04 to include the
steps necessary to compile clang-15 and clang-16.
Change-Id: I2bba6393ab93a6ce05a2c3ce31f3bbc71bcdca7c