Add github commit and compare URL to job detail page

jobserver/views/jobs.py

@@ -102,6 +102,15 @@ def get(self, request, *args, **kwargs):
                 honeycomb.previous_actions_link(job)
             )
 
+        previous_job_request = JobRequest.objects.previous(job.job_request)
+        compare_url = (
+            job.job_request.workspace.repo.get_compare_url(
+                previous_job_request.sha, job.job_request.sha
+            )
+            if previous_job_request
+            else None
+        )
+
         context = {
             "cancellation_requested": job.action in job.job_request.cancelled_actions,
             "job": job,
@@ -111,6 +120,7 @@ def get(self, request, *args, **kwargs):
             "user_can_cancel_jobs": can_cancel_jobs,
             "view": self,
             "honeycomb_links": honeycomb_links,
+            "compare_url": compare_url,
         }
 
         return TemplateResponse(request, "job/detail.html", context=context)

templates/job/detail.html

@@ -185,6 +185,16 @@ <h1 class="min-w-0 text-3xl break-words md:text-4xl font-bold text-slate-900">
           -
           {% endif %}
         {% /description_item %}
+
+        {% #description_item title="Git commit hash" stacked=True %}
+          {% link href=job.job_request.get_repo_url text=job.job_request.sha|slice:7|default:"-" %}
+        {% /description_item %}
+
+        {% if compare_url %}
+          {% #description_item title="Compare code" stacked=True %}
+            {% link href=compare_url text="View on GitHub" %}
+          {% /description_item %}
+        {% endif %}
       </dl>
     {% /card %}