x/playground: version stated on "About" page is sometimes one version behind

[dmitshur]

The current latest Go release is Go 1.14.6.

Clicking the About button at https://play.golang.org now says:

The playground uses the latest stable release of Go.
The current version is go1.14.5.

However, running the https://play.golang.org/p/Ztyu2FJaajl program suggests the actual playground program execution uses Go 1.14.6. So it's only the frontend that's on the previous version.

So it's not a big deal, but need to understand why this happens and fix it.

/cc @toothrot

[dmitshur]

By now (after some number of days have passed), it says "The current version is go1.14.6." on the About page.

[dmitshur]

As another data point, https://play.golang.org/p/Ztyu2FJaajl says "go1.15" now (which was just released) but the About page still says "The current version is go1.14.7."

[gopherbot]

Change https://golang.org/cl/294549 mentions this issue: playground: show real go runtime version in About document

[toothrot]

The playground builds the sandbox environment at the latest version of Go, but builds the front-end code at the bootstrap version. This is mostly because the Go artifacts aren't available

We should also run the front-end at the latest version of Go.

Fixing it this way is blocked by #44389.

[gopherbot]

Change https://golang.org/cl/295649 mentions this issue: all: support Go 1.16 in the Go Playground

[toothrot]

Fixed and deployed.