WORKING (Debian 8)
 # context --trackers=resolvers.details
resolvers       | resolving | file 'mtx-context.lua' is not readable
resolvers       | resolving | checking name 'mtx-context.lua'
resolvers       | resolving | deep checking 'selfautoparent:texmf-project', base 'mtx-context.lua', pattern 'false'
resolvers       | resolving | deep checking 'selfautoparent:texmf-fonts', base 'mtx-context.lua', pattern 'false'
resolvers       | resolving | deep checking 'selfautoparent:texmf-local', base 'mtx-context.lua', pattern 'false'
resolvers       | resolving | deep checking 'selfautoparent:texmf-modules', base 'mtx-context.lua', pattern 'false'
resolvers       | resolving | deep checking 'selfautoparent:texmf-context', base 'mtx-context.lua', pattern 'false'
resolvers       | methods | resolving, method 'concatinators', how 'tag', tag 'file'
resolvers       | resolving | match: variant 'file', search 'selfautoparent:texmf-context/scripts/context/lua/mtx-context.lua', result 'selfautoparent:texmf-context/scripts/context/lua/mtx-context.lua'
resolvers       | resolving | deep checking 'selfautoparent:texmf-linux-64', base 'mtx-context.lua', pattern 'false'
resolvers       | resolving | deep checking 'selfautoparent:texmf', base 'mtx-context.lua', pattern 'false'
resolvers       | resolving | checking filename 'mtx-context.lua' in tree
resolvers       | resolving | using pattern '^%./$' for path '.'
resolvers       | resolving | no match to '^%./$' in hash for file 'selfautoparent:texmf-context/scripts/context/lua/mtx-context.lua' and path 'selfautoparent:texmf-context/scripts/context/lua/'
resolvers       | resolving | quick root scan for '.'
resolvers       | resolving | file './mtx-context.lua' is not readable
resolvers       | resolving | using pattern '^home:texmf/tex/context/.*$' for path 'home:texmf/tex/context//'
…

NON-WORKING (Alpine 3.7)
 # context --trackers=resolvers.details
resolvers       | resolving | file 'mtx-context.lua' is not readable
resolvers       | resolving | checking name 'mtx-context.lua'
resolvers       | resolving | deep checking 'selfautoparent:texmf-project', base 'mtx-context.lua', pattern 'false'
resolvers       | resolving | deep checking 'selfautoparent:texmf-fonts', base 'mtx-context.lua', pattern 'false'
resolvers       | resolving | deep checking 'selfautoparent:texmf-local', base 'mtx-context.lua', pattern 'false'
resolvers       | resolving | deep checking 'selfautoparent:texmf-modules', base 'mtx-context.lua', pattern 'false'
resolvers       | resolving | deep checking 'selfautoparent:texmf-context', base 'mtx-context.lua', pattern 'false'
resolvers       | resolving | deep checking 'selfautoparent:texmf-linuxmusl-64', base 'mtx-context.lua', pattern 'false'
resolvers       | resolving | deep checking 'selfautoparent:texmf', base 'mtx-context.lua', pattern 'false'
resolvers       | resolving | checking filename 'mtx-context.lua' in tree
resolvers       | resolving | quick root scan for '.'
resolvers       | resolving | file './mtx-context.lua' is not readable
resolvers       | resolving | checking filename 'mtx-context.lua', filetype 'scripts', wanted files 'mtx-context.lua’.
…