website: Add badges for build status

Adds three badges, one for nightly, weekly, and compiler tests to the
homepage.

See https://imgur.com/mCNZoUl for an example of what the new page looks
like.

Signed-off-by: Jason Lowe-Power <jason@lowepower.com>
Change-Id: Id5a28cd31deb91f80001df741f681685db20c3b0
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5-website/+/51467
Reviewed-by: Bobby R. Bruce <bbruce@ucdavis.edu>
Maintainer: Bobby R. Bruce <bbruce@ucdavis.edu>
Tested-by: Bobby R. Bruce <bbruce@ucdavis.edu>
diff --git a/_sass/_layout.scss b/_sass/_layout.scss
index 591052a..a218cc0 100755
--- a/_sass/_layout.scss
+++ b/_sass/_layout.scss
@@ -200,6 +200,24 @@
   }
 }
 
+/**** Testing status ****/
+div.testing-status {
+  overflow: auto;
+  width: 60%;
+  margin: auto;
+  text-align: center;
+  .testing-title {
+    float: left;
+    padding-top: 1em;
+  }
+  .testing-info {
+    overflow: hidden;
+    ul {
+      list-style: none;
+    }
+  }
+}
+
 
 /**** CARD ****/
 div.card {
diff --git a/index.html b/index.html
index 42605ff..448cebc 100755
--- a/index.html
+++ b/index.html
@@ -22,6 +22,18 @@
   <a href="https://gem5-review.googlesource.com/"><button type="button" class="btn btn-outline-primary">Code Review</button></a>
   <a href="https://arxiv.org/abs/2007.03152"><button type="button" class="btn btn-outline-primary">gem5-20+ paper</button></a>
 
+  <div class="testing-status">
+    <div class="testing-title">
+    <h3>Testing Status:</h3>
+    </div>
+    <div class="testing-info">
+    <ul>
+      <li><a href='https://jenkins.gem5.org/job/nightly/'><img src='https://jenkins.gem5.org/buildStatus/icon?job=nightly&style=plastic&subject=Nightly%20Tests%20ran%20${startTime}%20ago%20for%20${duration}'></a></li>
+      <li><a href='https://jenkins.gem5.org/job/weekly/'><img src='https://jenkins.gem5.org/buildStatus/icon?job=weekly&style=plastic&subject=Weekly%20Tests%20ran%20${startTime}%20ago%20for%20${duration}'></a></li>
+      <li><a href='https://jenkins.gem5.org/job/compiler-checks/'><img src='https://jenkins.gem5.org/buildStatus/icon?job=compiler-checks&style=plastic&subject=Compiler%20Tests%20ran%20${startTime}%20ago%20for%20${duration}'></a></li>
+    </ul>
+    </div>
+  </div>
 
 </header>