Fix GitHub actions

[RodolfoFigueroa]

After the introduction of the webUI, none of the GitHub actions worked correctly. Here are the respective errors:

• build/build-dev: Node has long dropped support for linux/386 systems, so the node:20-alpine image is incompatible. Additionally, the QEMU emulator GitHub uses to build arm images kept crashing.
• lint: Tries to check embedded files that don't exist yet.

Here are the fixes, plus some additional tweaks I made:

.github/workflows/release.yaml:

• Remove linux/386 platform target.
• Create a dummy dist/ directory before the lint step runs.
• Remove repo lowercase step and replace it with Docker's official metadata-action.
• Bump some action versions

Dockerfile

• Add --platform=$BUILDPLATFORM to build stages to allow Node and Go to use their native architecture while building. This removes the dependency on QEMU and speeds up builds

[LumePart]

Thanks for the PR! Merged