Fix typo in publishing build job & restore cross-compilation (#1430)

* Fix typo in publishing build job

This prevented the cross-compilation targets from using the `cross`
binary for the compilation.

The script evaluated with `${{ matrix.job.cross }}` to:
```
  if [[ "" == "true" ]]; then
    cross build --release --target x86_64-unknown-linux-musl
  else
    cargo build --release --target x86_64-unknown-linux-musl
  fi
```

The correct result for `${{ matrix.job.use-cross }}` is:
```
  if [[ "true" == "true" ]]; then
    cross build --release --target x86_64-unknown-linux-musl
  else
    cargo build --release --target x86_64-unknown-linux-musl
  fi
```

* Restore previously failed cross-compilation targets

- Revert "Delete the remaining failing cross-compilation target"

  This reverts commit 2937f3277a10d660bdb920ee6d5b9f033f6d97ef.

- Revert "Delete another failing cross-compilation target"

  This reverts commit 4af8adf580818b57baa062bb7cd89a1cb72f1fbb.

- Revert "Delete i686-unknown-linux-gnu job"

  This reverts commit eebddddb0a8c41f1225d9cd9a50d70128642623f.

- Revert "Delete arm-unknown-linux-gnueabihf job"

  This reverts commit 9a2fa348eb4470a73790cc24320f1964783264c4.

0 files changed, 0 insertions, 0 deletions