Add rust-std-esp builder

[SergioGasquez]

• Remove fetch.sh for rust-nostd-esp
• Add rust-std-esp builder
  • It works for all the targets
  • It allows having the Cargo.toml in the project as with no_std
  • I've set ESP_IDF_TOOLS_INSTALL_DIR to global, so esp-idf installation can be reused.
  • I've commented the cargo audit step in compile.sh because esp-idf-hal depends on a time version with vulnerability at the moment:

  Crate:     time
  Version:   0.1.45
  Title:     Potential segfault in the time crate
  Date:      2020-11-18
  ID:        RUSTSEC-2020-0071
  URL:       https://rustsec.org/advisories/RUSTSEC-2020-0071
  Severity:  6.2 (medium)
  Solution:  Upgrade to >=0.2.23
  Dependency tree:
  time 0.1.45
  └── chrono 0.4.24
      └── build-time 0.1.2
          └── esp-idf-sys 0.32.1
              ├── esp32 0.1.0
              ├── esp-idf-svc 0.45.0
              │   └── esp32 0.1.0
              └── esp-idf-hal 0.40.1
                  ├── esp32 0.1.0
                  └── esp-idf-svc 0.45.0
  
  error: 1 vulnerability found!
  

[SergioGasquez]

I've re-enabled the cargo audit check ignoring the RUSTSEC-2020-0071 vulnerability and added the assets folder required to build the esp-clock project. The esp-clock project with its own Cargo.toml file took about 50 secs to build for the first time.

[urish]

So are we good to merge?

[SergioGasquez]

So are we good to merge?

Yes! 🚀

[urish]

The new build is in production now!