nightly: Fix asset names with nightly as version string

[JoeKar]

I realized using $VERSION within the archive resp. asset name is counterproductive when used for the nightly upload, because the softprops/action-gh-release will only delete and update assets with the same name present.
Having an updated from e.g. 2.0.14-dev.243 -> 2.0.14-dev.244 -> 2.0.14-dev.245 fills the nightly "release" with all of the assets.
The correction of the nightlies currently needs manual adjustment to be cleaned up.

So I suggest to slightly adapt the tools/cross-compile.sh again to allow a custom string as archive version, if given otherwise use the parsed version. The nightly action then can use tools/cross-compile.sh nightly to provide fixed asset names, which will be properly handled by the softprops/action-gh-release action.
I wasn't able to find an option cleaning up all the assets present at one release.

Side note:
The SHA sum created for the nightlies is only valid till the next build will be done for the same version.

[dmaluka]

The correction of the nightlies currently needs manual adjustment to be cleaned up.

Right now I see only 2.0.14-dev.245 in https://github.com/zyedidia/micro/releases/tag/nightly. Does it mean that you have manually removed all older builds?

[JoeKar]

Yes, it does. We had 3 times the nightly assets attached to the nightly release. Before there was any further confusion I cleaned them up.

[dmaluka]

LGTM if there no other easy way to delete old assets automatically (e.g. by customizing softprops/action-gh-release or whatever).

[JoeKar]

At least there is no easy AND fast way.

We could create a upstream feature request or fork it and modify softprops/action-gh-release/src/github.ts#L165-L170 by iterating over all the currentAssets depending on an additional configuration switch.
Most probably a PR to the upstream project is then welcome.

But I'm not in a situation to try to improve one more project, since I already lack time to support micro.
So for the moment I feel comfortable with the "workaround".

In case you like to support here we can then (after softprops/action-gh-release includes the feature) simply remove the nightly argument when calling tools/cross-compile.sh in our action and return to the actual situation creating assets with the version in the archive name.