Add test failure annotations on v1.8+ (#58)

Co-authored-by: Dilum Aluthge <dilum@aluthge.com>

action.yml

@@ -29,6 +29,9 @@ inputs:
   project:
     description: 'Value passed to the --project flag. The default value is the repository root: "@."'
     default: '@.'
+  annotate:
+    description: 'Whether or not to attempt to create GitHub annotations to show test failures inline. Only effective on Julia 1.8+.'
+    default: 'false'
 
 runs:
   using: 'composite'
@@ -49,9 +52,18 @@ runs:
         # the request metadata to pkg.julialang.org when installing
         # packages via `Pkg.test`.
         JULIA_PKG_SERVER: ""
+    - name: Install dependencies in their own (shared) environment
+      run: |
+        if VERSION > v"1.8pre"
+          using Pkg
+          Pkg.activate("tests-logger-env"; shared=true)
+          Pkg.add(Pkg.PackageSpec(name="GitHubActions", version="0.1"))
+        end
+      shell: julia --color=yes {0}
+      if: inputs.annotate == 'true'
     - run: |
         # The Julia command that will be executed
-        julia_cmd=( julia --color=yes --depwarn=${{ inputs.depwarn }} --inline=${{ inputs.inline }} --project=${{ inputs.project }} -e 'import Pkg;include(joinpath(ENV["GITHUB_ACTION_PATH"], "kwargs.jl"));kwargs = Kwargs.kwargs(;coverage = :(${{ inputs.coverage }}),force_latest_compatible_version = :(${{ inputs.force_latest_compatible_version }}), julia_args = ["--check-bounds=${{ inputs.check_bounds }}"]);Pkg.test(; kwargs...)' )
+        julia_cmd=( julia --color=yes --depwarn=${{ inputs.depwarn }} --inline=${{ inputs.inline }} --project=${{ inputs.project }} -e 'include(joinpath(ENV["GITHUB_ACTION_PATH"], "test_harness.jl"))' )
 
         # Add the prefix in front of the command if there is one
         prefix="${{ inputs.prefix }}"
@@ -60,3 +72,8 @@ runs:
         # Run the Julia command
         "${julia_cmd[@]}"
       shell: bash
+      env:
+        ANNOTATE: ${{ inputs.annotate }}
+        COVERAGE: ${{ inputs.coverage }}
+        FORCE_LATEST_COMPATIBLE_VERSION: ${{ inputs.force_latest_compatible_version }}
+        CHECK_BOUNDS: ${{ inputs.check_bounds }}