feat: show build number value in the About if present in the config (#14955)

diff --git a/superset-frontend/src/components/Menu/Menu.test.tsx b/superset-frontend/src/components/Menu/Menu.test.tsx
index 212521b..f3a2fd1 100644
--- a/superset-frontend/src/components/Menu/Menu.test.tsx
+++ b/superset-frontend/src/components/Menu/Menu.test.tsx
@@ -103,6 +103,7 @@
       locale: 'en',
       version_string: '1.0.0',
       version_sha: 'randomSHA',
+      build_number: 'randomBuildNumber',
     },
     settings: [
       {
@@ -280,10 +281,10 @@
   expect(profile).toHaveAttribute('href', user_profile_url);
 });
 
-test('should render the About section and version_string or sha when available', async () => {
+test('should render the About section and version_string, sha or build_number when available', async () => {
   const {
     data: {
-      navbar_right: { version_sha, version_string },
+      navbar_right: { version_sha, version_string, build_number },
     },
   } = mockedProps;
 
@@ -292,9 +293,11 @@
   const about = await screen.findByText('About');
   const version = await screen.findByText(`Version: ${version_string}`);
   const sha = await screen.findByText(`SHA: ${version_sha}`);
+  const build = await screen.findByText(`Build: ${build_number}`);
   expect(about).toBeInTheDocument();
   expect(version).toBeInTheDocument();
   expect(sha).toBeInTheDocument();
+  expect(build).toBeInTheDocument();
 });
 
 test('should render the Documentation link when available', async () => {
diff --git a/superset-frontend/src/components/Menu/Menu.tsx b/superset-frontend/src/components/Menu/Menu.tsx
index 098aa3a..13d19fb 100644
--- a/superset-frontend/src/components/Menu/Menu.tsx
+++ b/superset-frontend/src/components/Menu/Menu.tsx
@@ -44,6 +44,7 @@
   bug_report_url?: string;
   version_string?: string;
   version_sha?: string;
+  build_number?: string;
   documentation_url?: string;
   languages: Languages;
   show_language_picker: boolean;
diff --git a/superset-frontend/src/components/Menu/MenuRight.tsx b/superset-frontend/src/components/Menu/MenuRight.tsx
index 35d2cb0..1626713 100644
--- a/superset-frontend/src/components/Menu/MenuRight.tsx
+++ b/superset-frontend/src/components/Menu/MenuRight.tsx
@@ -146,7 +146,9 @@
             </Menu.Item>
           </Menu.ItemGroup>,
         ]}
-        {(navbarRight.version_string || navbarRight.version_sha) && [
+        {(navbarRight.version_string ||
+          navbarRight.version_sha ||
+          navbarRight.build_number) && [
           <Menu.Divider key="version-info-divider" />,
           <Menu.ItemGroup key="about-section" title={t('About')}>
             <div className="about-section">
@@ -165,6 +167,11 @@
                   SHA: {navbarRight.version_sha}
                 </div>
               )}
+              {navbarRight.build_number && (
+                <div css={versionInfoStyles}>
+                  Build: {navbarRight.build_number}
+                </div>
+              )}
             </div>
           </Menu.ItemGroup>,
         ]}
diff --git a/superset/config.py b/superset/config.py
index 7ccb695..c4b3a66 100644
--- a/superset/config.py
+++ b/superset/config.py
@@ -112,6 +112,10 @@
 VERSION_SHA_LENGTH = 8
 VERSION_SHA = _try_json_readsha(VERSION_INFO_FILE, VERSION_SHA_LENGTH)
 
+# Build number is shown in the About section if available. This
+# can be replaced at build time to expose build information.
+BUILD_NUMBER = None
+
 # default viz used in chart explorer
 DEFAULT_VIZ_TYPE = "table"
 
diff --git a/superset/views/base.py b/superset/views/base.py
index 61bd312..9d27861 100644
--- a/superset/views/base.py
+++ b/superset/views/base.py
@@ -309,6 +309,7 @@
     brand_text = appbuilder.app.config["LOGO_RIGHT_TEXT"]
     if callable(brand_text):
         brand_text = brand_text()
+    build_number = appbuilder.app.config["BUILD_NUMBER"]
     return {
         "menu": menu,
         "brand": {
@@ -326,6 +327,7 @@
             "documentation_url": appbuilder.app.config["DOCUMENTATION_URL"],
             "version_string": appbuilder.app.config["VERSION_STRING"],
             "version_sha": appbuilder.app.config["VERSION_SHA"],
+            "build_number": build_number,
             "languages": languages,
             "show_language_picker": len(languages.keys()) > 1,
             "user_is_anonymous": g.user.is_anonymous,