By default, azure auto-computes MD5 for all blobs < 64MBs.
However, many of our binaries exceed 64MB so md5 has to be computed
manually.
With this patch, MD5 hash will be set to all our CDN uploads and could
be retrieved as `content-md5` header, e.g.:
```bash
$ curl -I https://playwright.azureedge.net/builds/ffmpeg/1001/ffmpeg-win32.zip
```
Fixes#10173
This way bash won't expand and post-process variable values in any way.
The changes are driven with
[`shellcheck`](https://github.com/koalaman/shellcheck)
This patch establishes the following convention:
- scripts `checkout_build_archive_upload.sh` and `upload.sh` now accept
build flavor instead of browser name. Build flavor fully defines the
build produced / uploaded.
- scripts under `//browser_patches/webkit` and
`//browser_patches/firefox` produce build that is specific to the host
system.
Both `checkout_build_archive_upload.sh` and `upload.sh` scripts now
accept a `firefox-win64` browser instead of an optional `--win64` flag.
This is a preparation before introducing `webkit-wpe` parameter in these
scripts.
