Make coverage optional (#19)

* Make coverage optional

* Apply suggestions from code review

* typo

action.yml

@@ -10,6 +10,9 @@ inputs:
   inline:
     description: 'Value passed to the --inline flag. Options: yes | no. Default value: yes.'
     default: 'yes'
+  coverage:
+    description: 'Value determining whether to test with coverage or not. Options: true | false. Default value: true.'
+    default: 'true'
 
 runs:
   using: 'composite'
@@ -30,5 +33,5 @@ runs:
         # the request metadata to pkg.julialang.org when installing
         # packages via `Pkg.test`.
         JULIA_PKG_SERVER: ""
-    - run: julia --color=yes --check-bounds=yes --inline=${{ inputs.inline }} --project -e 'using Pkg; Pkg.test(coverage=true)'
+    - run: julia --color=yes --check-bounds=yes --inline=${{ inputs.inline }} --project -e 'using Pkg; Pkg.test(coverage=${{ inputs.coverage }})'
       shell: bash