[dashboard] Introduce showUseLastSuccessfulPrebuild feature flag

Author: jankeromnes

Diff for: components/dashboard/src/contexts/FeatureFlagContext.tsx

@@ -18,9 +18,11 @@ interface FeatureFlagConfig {
 const FeatureFlagContext = createContext<{
     showPersistentVolumeClaimUI: boolean;
     showUsageView: boolean;
+    showUseLastSuccessfulPrebuild: boolean;
 }>({
     showPersistentVolumeClaimUI: false,
     showUsageView: false,
+    showUseLastSuccessfulPrebuild: false,
 });
 
 const FeatureFlagContextProvider: React.FC = ({ children }) => {
@@ -31,13 +33,15 @@ const FeatureFlagContextProvider: React.FC = ({ children }) => {
     const team = getCurrentTeam(location, teams);
     const [showPersistentVolumeClaimUI, setShowPersistentVolumeClaimUI] = useState<boolean>(false);
     const [showUsageView, setShowUsageView] = useState<boolean>(false);
+    const [showUseLastSuccessfulPrebuild, setShowUseLastSuccessfulPrebuild] = useState<boolean>(false);
 
     useEffect(() => {
         if (!user) return;
         (async () => {
             const featureFlags: FeatureFlagConfig = {
                 persistent_volume_claim: { defaultValue: true, setter: setShowPersistentVolumeClaimUI },
                 usage_view: { defaultValue: false, setter: setShowUsageView },
+                showUseLastSuccessfulPrebuild: { defaultValue: false, setter: setShowUseLastSuccessfulPrebuild },
             };
             for (const [flagName, config] of Object.entries(featureFlags)) {
                 const flagValue = await getExperimentsClient().getValueAsync(flagName, config.defaultValue, {
@@ -53,7 +57,9 @@ const FeatureFlagContextProvider: React.FC = ({ children }) => {
     }, [user, teams, team, project]);
 
     return (
-        <FeatureFlagContext.Provider value={{ showPersistentVolumeClaimUI, showUsageView }}>
+        <FeatureFlagContext.Provider
+            value={{ showPersistentVolumeClaimUI, showUsageView, showUseLastSuccessfulPrebuild }}
+        >
             {children}
         </FeatureFlagContext.Provider>
     );

Diff for: components/dashboard/src/start/CreateWorkspace.tsx

@@ -29,6 +29,7 @@ import { BillingAccountSelector } from "../components/BillingAccountSelector";
 import { AttributionId } from "@gitpod/gitpod-protocol/lib/attribution";
 import { TeamsContext } from "../teams/teams-context";
 import Alert from "../components/Alert";
+import { FeatureFlagContext } from "../contexts/FeatureFlagContext";
 
 export interface CreateWorkspaceProps {
     contextUrl: string;
@@ -541,6 +542,7 @@ interface RunningPrebuildViewProps {
 
 function RunningPrebuildView(props: RunningPrebuildViewProps) {
     const workspaceId = props.runningPrebuild.workspaceID;
+    const { showUseLastSuccessfulPrebuild } = useContext(FeatureFlagContext);
 
     useEffect(() => {
         const disposables = new DisposableCollection();
@@ -569,12 +571,14 @@ function RunningPrebuildView(props: RunningPrebuildViewProps) {
             {/* TODO(gpl) Copied around in Start-/CreateWorkspace. This should properly go somewhere central. */}
             <div className="h-full mt-6 w-11/12 lg:w-3/5">
                 <PrebuildLogs workspaceId={workspaceId} onIgnorePrebuild={props.onIgnorePrebuild}>
-                    <button
-                        className="secondary"
-                        onClick={() => props.onUseLastSuccessfulPrebuild && props.onUseLastSuccessfulPrebuild()}
-                    >
-                        Use Last Successful Prebuild
-                    </button>
+                    {showUseLastSuccessfulPrebuild && (
+                        <button
+                            className="secondary"
+                            onClick={() => props.onUseLastSuccessfulPrebuild && props.onUseLastSuccessfulPrebuild()}
+                        >
+                            Use Last Successful Prebuild
+                        </button>
+                    )}
                     <button className="secondary" onClick={() => props.onIgnorePrebuild && props.onIgnorePrebuild()}>
                         Skip Prebuild
                     </button>