feat: pick up PR's head commit from GitHub context (#29)

action.yml

@@ -3,7 +3,7 @@ description: 'GitHub Action that uploads test coverage reports to DeepSource for
 author: 'Sanket Saurav <sanket@deepsource.io>'
 inputs:
   key:
-    description: 'Programming language shortcode for which coverage is reported. Allowed values are — python, go'
+    description: 'Programming language shortcode for which coverage is reported. Allowed values are — python, go, javascript, ruby, java, kotlin, scala, php, csharp, cxx, rust, swift'
     required: true
   coverage-file:
     description: 'Path to the coverage data file. e.g. ./coverage.xml'
@@ -14,6 +14,10 @@ inputs:
   fail-ci-on-error:
     description: 'Should the CI build fail if there is an error while uploading the report to DeepSource? Allowed values are — true, false'
     default: false
+  commit-sha:
+    description: 'HEAD commit for which the Test Coverage report is being sent'
+    required: false
+    default: ${{ github.event.pull_request.head.sha }}
 branding:
   color: 'green'
   icon: 'umbrella'

main.py

@@ -10,6 +10,7 @@
     "coverage_file": "INPUT_COVERAGE-FILE",
     "dsn": "INPUT_DSN",
     "fail_ci_on_error": "INPUT_FAIL-CI-ON-ERROR",
+    "commit_sha": "INPUT_COMMIT-SHA",
 }
 
 DEEPSOURCE_CLI_PATH = "/app/bin/deepsource"
@@ -45,7 +46,11 @@ def main() -> None:
     # skipcq: BAN-B603, PYL-W1510
     process = subprocess.run(
         command,
-        env=dict(os.environ, DEEPSOURCE_DSN=input_data["dsn"]),
+        env=dict(
+            os.environ,
+            DEEPSOURCE_DSN=input_data["dsn"],
+            GHA_HEAD_COMMIT_SHA=input_data["commit_sha"],
+        ),
         capture_output=True,
     )