install.sh: line 109: /opt/context/bin/mtxrun: not found
cp: cannot stat '/opt/context/tex/texmf-linuxmusl/bin/mtxrun': No such file or directory
cp: cannot stat '/opt/context/tex/texmf-context/scripts/context/lua/mtxrun.lua': No such file or directory
cp: cannot stat '/opt/context/tex/texmf-context/scripts/context/lua/mtx-install.lua': No such file or directory

If you want to run ConTeXt everywhere, you need to adapt the path, like:

  export PATH=/opt/context/tex/texmf-linuxmusl/bin:$PATH

If you run from an editor you can specify the full path to mtxrun:

  /opt/context/tex/texmf-linuxmusl/bin/mtxrun --autogenerate --script context --autopdf ...

If you also want to run LuaTeX and MkIV you can provide --luatex but first the file
database has to be generated (this time with context and not mtxrun):

  context --luatex --generate
  context --luatex --make

The following settings were used:

  server   : lmtx.pragma-ade.com,lmtx.pragma-ade.nl,lmtx.contextgarden.net
  instance : install-lmtx
  extras   : 
  ownpath  : /opt/context
  platform : linuxmusl