Run opacheck on entire dir for more context (#4531)

Running `opa check` on a single file can report errors that might not
exist when considering other files in the same directory

Author: redbmk

ale_linters/rego/opacheck.vim

@@ -11,7 +11,7 @@ function! ale_linters#rego#opacheck#GetCommand(buffer) abort
     let l:options = ale#Var(a:buffer, 'rego_opacheck_options')
 
     return ale#Escape(ale_linters#rego#opacheck#GetExecutable(a:buffer))
-    \   . ' check %s --format json '
+    \   . ' check %s:h --format json '
     \   . (!empty(l:options) ? ' ' . l:options : '')
 endfunction
 

test/linter/test_rego_opacheck.vader

@@ -8,9 +8,9 @@ After:
 
 Execute(The default command should be correct):
   AssertLinter 'opa',
-  \ ale#Escape('opa') . ' check %s --format json '
+  \ ale#Escape('opa') . ' check %s:h --format json '
 
 Execute(The default command should be overridden):
   let b:ale_rego_opacheck_executable = '/bin/other/opa'
   AssertLinter '/bin/other/opa',
-  \ ale#Escape('/bin/other/opa') . ' check %s --format json '
+  \ ale#Escape('/bin/other/opa') . ' check %s:h --format json '