OSSM-6901: Create banner for Service Mesh 3.0 Tech Preview release

Author: rh-tokeefe

_templates/_page_openshift.html.erb

@@ -75,6 +75,14 @@
       </span>
       <% end %>
 
+      <% if (distro_key == "openshift-service-mesh") %>
+      <span>
+        <div class="alert alert-danger" role="alert" id="support-alert">
+          <strong>OpenShift Service Mesh 3.0 is a Technology Preview feature only. Technology Preview features are not supported with Red Hat production service level agreements (SLAs) and might not be functionally complete. Red Hat does not recommend using them in production. These features provide early access to upcoming product features, enabling customers to test functionality and provide feedback during the development process. This documentation is a work in progress and might not be complete or fully tested.</strong>.
+        </div>
+      </span>
+      <% end %>
+
       <% if (version == "4.17") && (distro_key != "openshift-webscale" && distro_key != "openshift-dpu" && distro_key != "rosa-hcp") %>
       <span>
         <div class="alert alert-danger" role="alert" id="support-alert">
@@ -271,6 +279,13 @@
             <select id="version-selector" onchange="versionSelector(this);">
               <option value="1.0tp1">1.0tp1</option>
             </select>
+        <% elsif (distro_key == "openshift-service-mesh") %>
+            <a href="https://docs.openshift.com/service-mesh/<%= version %>/about/ossm-about-openshift-service-mesh.html">
+              <%= distro %>
+            </a>
+            <select id="version-selector" onchange="versionSelector(this);">
+              <option value="3.0.0tp1">1.0tp1</option>
+            </select>    
         <% elsif (distro_key == "openshift-telco") %>
             <a href="https://docs.openshift.com/container-platform-telco/<%= version %>/welcome/index.html">
               <%= distro %>
@@ -314,7 +329,7 @@
       <li class="hidden-xs active">
         <%= breadcrumb_topic %>
       </li>
-      <% if (distro_key != "openshift-origin" && distro_key != "openshift-aro" && distro_key != "openshift-acs"  && distro_key != "openshift-serverless"  && distro_key != "openshift-gitops" && distro_key != "openshift-pipelines" && distro_key != "openshift-builds" && distro_key != "openshift-lightspeed" && distro_key != "openshift-telco") %>
+      <% if (distro_key != "openshift-origin" && distro_key != "openshift-aro" && distro_key != "openshift-acs"  && distro_key != "openshift-serverless"  && distro_key != "openshift-gitops" && distro_key != "openshift-pipelines" && distro_key != "openshift-builds" && distro_key != "openshift-lightspeed" && distro_key != "openshift-service-mesh" && distro_key != "openshift-telco") %>
       <span text-align="right" style="float: right !important">
         <a href="https://github.com/openshift/openshift-docs/commits/<%=
         ((distro_key == "openshift-enterprise") ? "enterprise-#{version}"
@@ -512,7 +527,8 @@
     'openshift-pipelines' : ['docs_pipelines', version],
     'openshift-builds' : ['docs_builds', version],
     'openshift-gitops' : ['docs_gitops', version],
-    'openshift-lightspeed' : ['docs_lightspeed', version]
+    'openshift-lightspeed' : ['docs_lightspeed', version],
+    'openshift-service-mesh' : ['docs_service_mesh', version]
   };
 
   // only OSD v3 docs have the version variable specified