sysext: add wasmedge recipe

[hydai]

Add WasmEdge sysext

This PR creates a sysext for running WasmEdge on Flatcar.

How to use

Run create_wasmedge_sysext.sh for building the .raw file.

Then, use the following config:

variant: flatcar
version: 1.0.0
storage:
  files:
    - path: /opt/extensions/wasmedge-0.14.1-x86-64.raw
      mode: 0420
      contents:
        source: https://github.com/flatcar/sysext-bakery/releases/download/wasmedge-0.14.1-x86-64.raw
  links:
    - target: /opt/extensions/wasmedge-0.14.1-x86-64.raw
      path: /etc/extensions/wasmedge.raw
      hard: false

Testing done

I deployed an instance with Flatcar-Stable-4081.2.0 on DigitalOcean. You can provide any wasm file to verify it. I just used a very simple wasm that adds two numbers.

Last login: Tue Nov 26 04:32:52 UTC 2024 from 60.248.109.122 on ssh
Flatcar Container Linux by Kinvolk stable 4081.2.0 for DigitalOcean
core@core-3 ~ $ wasmedge --reactor /tmp/add.wasm add 1 3
4

Note:

For testing, I used the following template:

variant: flatcar
version: 1.0.0
storage:
  files:
    - path: /opt/extensions/wasmedge-0.14.1-x86-64.raw
      mode: 0420
      contents:
        source: https://github.com/second-state/flatcar-sysext-bakery/releases/download/0.0.1/wasmedge-0.14.1-x86-64.raw
  links:
    - target: /opt/extensions/wasmedge-0.14.1-x86-64.raw
      path: /etc/extensions/wasmedge.raw
      hard: false

[tormath1]

Thanks a lot for this contribution, I've tested it looks fine :)