feat: Static musl builds via nix

fix: don't do check on all builds

Checks can be done with `nix flake check`, no need to slow down build process with this.

feat: add static binary build instructions to docs

feat: add max-perf package

feat: add build-nix workflow

chore: add changelog

fix: fix max-perf-static packages not statically linking

feat: improve docs for building with nix

chore: more descriptive name for binary build step of workflow

fix: resolve review comment about Haswell CPUs

chore: enable __structuredAttrs on build

This is a good practice for modern nix packages

docs/deploying/generic.mdx

@@ -47,9 +47,15 @@ and, for amd64, target the haswell CPU architecture.
 
 ### Nix
 
-Theres a Nix package defined in our flake, available for Linux and MacOS. Add continuwuity as an input to your flake, and use `inputs.continuwuity.packages.${system}.default` to get a working Continuwuity package.
+If you wish to generate a static binary, you can do so using Nix: `nix build git+https://forgejo.ellis.link/continuwuation/continuwuity#packageName`, where `packageName` is one of:
 
-If you simply wish to generate a binary using Nix, you can run `nix build git+https://forgejo.ellis.link/continuwuation/continuwuity` to generate a binary in `result/bin/conduwuit`.
+- `default-static-x86_64`
+- `default-static-aarch64`
+- `max-perf-static-x86_64`
+- `max-perf-haswell-static-x86_64`
+- `max-perf-static-aarch64`
+
+`max-perf` takes longer to build, but has more runtime optimizations. Haswell builds are optimized for modern CPUs.
 
 ### Compiling
 

docs/deploying/nixos.mdx

@@ -47,9 +47,16 @@ The NixOS module provides these configuration options:
 - `extraEnvironment`: Extra environment variables to pass to the Continuwuity server
 - `package`: The Continuwuity package to use, defaults to `pkgs.matrix-continuwuity`
     - You may want to override this to be from our flake, for faster updates and unstable versions:
+
     ```nix
-    package = inputs.continuwuity.packages.${pkgs.stdenv.hostPlatform.system}.default;
+    package = inputs.continuwuity.packages.${pkgs.stdenv.hostPlatform.system}.packageName;
     ```
+
+    Where `packageName` is one of:
+    - `default`
+    - `max-perf`: Takes longer to build, but has more runtime optimizations
+    - `max-perf-haswell`: Optimized for modern CPUs, don't use if your CPU is not Haswell or later.
+
 - `admin.enable`: Whether to add the `conduwuit` binary to `PATH` for administration (enabled by default)
 - `settings`: The Continuwuity configuration