vim-patch:9.1.1042: filetype: just files are not recognized

Problem:  filetype: just files are not recognized
Solution: adjust filetype detection pattern, detect just shebang line,
          include just ftplugin, indent and syntax plugin
          (Peter Benjamin)

closes: vim/vim#16466

72755b3c8e

Co-authored-by: Peter Benjamin <petermbenjamin@gmail.com>

runtime/lua/vim/filetype.lua

@@ -661,6 +661,8 @@ local extension = {
   jsp = 'jsp',
   jl = 'julia',
   just = 'just',
+  Just = 'just',
+  JUST = 'just',
   kl = 'karel',
   KL = 'karel',
   kdl = 'kdl',
@@ -1650,8 +1652,11 @@ local filename = {
   ['.vsconfig'] = 'jsonc',
   ['bun.lock'] = 'jsonc',
   ['.justfile'] = 'just',
+  ['.Justfile'] = 'just',
+  ['.JUSTFILE'] = 'just',
   ['justfile'] = 'just',
   ['Justfile'] = 'just',
+  ['JUSTFILE'] = 'just',
   Kconfig = 'kconfig',
   ['Kconfig.debug'] = 'kconfig',
   ['Config.in'] = 'kconfig',

runtime/lua/vim/filetype/detect.lua

@@ -1877,6 +1877,7 @@ local patterns_hashbang = {
   ruby = 'ruby',
   ['node\\(js\\)\\=\\>\\|js\\>'] = { 'javascript', { vim_regex = true } },
   ['rhino\\>'] = { 'javascript', { vim_regex = true } },
+  just = 'just',
   -- BC calculator
   ['^bc\\>'] = { 'bc', { vim_regex = true } },
   ['sed\\>'] = { 'sed', { vim_regex = true } },