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

nix/packages/continuwuity.nix

@@ -5,11 +5,10 @@
   liburing,
   craneLib,
   pkg-config,
-  callPackage,
   rustPlatform,
   cargoExtraArgs ? "",
   rustflags ? "",
-  rocksdb ? callPackage ./rocksdb.nix { },
+  target_cpu ? null,
   profile ? "release",
 }:
 let
@@ -28,18 +27,24 @@ let
   };
 
   attrs = {
+    __structuredAttrs = true;
+    strictDeps = true;
+
     inherit src;
+
     nativeBuildInputs = [
       pkg-config
       rustPlatform.bindgenHook
     ];
     buildInputs = lib.optionals stdenv.hostPlatform.isLinux [ liburing ];
+    doCheck = false;
     env = {
-      ROCKSDB_INCLUDE_DIR = "${rocksdb}/include";
-      ROCKSDB_LIB_DIR = "${rocksdb}/lib";
       CARGO_PROFILE = profile;
       RUSTFLAGS = rustflags;
-    };
+    }
+    // (lib.optionalAttrs (target_cpu != null) {
+      TARGET_CPU = target_cpu;
+    });
   };
 in
 craneLib.buildPackage (
@@ -47,18 +52,6 @@ craneLib.buildPackage (
     inherit cargoExtraArgs;
     cargoArtifacts = craneLib.buildDepsOnly attrs;
 
-    # Needed to make continuwuity link to rocksdb
-    postFixup = lib.optionalString stdenv.hostPlatform.isLinux ''
-      old_rpath="$(patchelf --print-rpath $out/bin/conduwuit)"
-      extra_rpath="${
-        lib.makeLibraryPath [
-          rocksdb
-        ]
-      }"
-
-      patchelf  --set-rpath "$old_rpath:$extra_rpath" $out/bin/conduwuit
-    '';
-
     meta = {
       description = "A community-driven Matrix homeserver in Rust";
       mainProgram = "conduwuit";

nix/packages/default.nix

@@ -1,4 +1,5 @@
 {
+  inputs,
   self,
   ...
 }:
@@ -6,29 +7,77 @@
   perSystem =
     {
       self',
+      lib,
       pkgs,
+      system,
       craneLib,
       ...
     }:
     {
-      packages = {
-        rocksdb = pkgs.callPackage ./rocksdb.nix { };
-        default = pkgs.callPackage ./continuwuity.nix {
-          inherit self craneLib;
-          # extra features via `cargoExtraArgs`
-          cargoExtraArgs = "-F http3";
-          # extra RUSTFLAGS via `rustflags`
-          # the stuff below is required for http3
-          rustflags = "--cfg reqwest_unstable";
-        };
-        # users may also override this with other cargo profiles to build for other feature sets
-        #
-        # other examples include:
-        #
-        # - release-high-perf
-        max-perf = self'.packages.default.override {
-          profile = "release-max-perf";
-        };
-      };
+      packages =
+        let
+          mkPackages =
+            pkgs:
+            let
+              fnx = inputs.fenix.packages.${system};
+
+              isStatic = pkgs.stdenv.hostPlatform.isMusl;
+
+              craneLib = (inputs.crane.mkLib pkgs).overrideToolchain (
+                _:
+                if isStatic then
+                  fnx.combine [
+                    self'.packages.stable-toolchain
+                    (fnx.targets.${pkgs.stdenv.hostPlatform.config}.stable).rust-std
+                  ]
+                else
+                  self'.packages.stable-toolchain
+              );
+
+              default = pkgs.callPackage ./continuwuity.nix {
+                inherit self craneLib;
+                liburing = (if isStatic then pkgs.pkgsStatic else pkgs).liburing;
+                # extra features via `cargoExtraArgs`
+                cargoExtraArgs = "-F http3";
+                # extra RUSTFLAGS via `rustflags`
+                # the stuff below is required for http3
+                rustflags = "--cfg reqwest_unstable";
+              };
+
+              # users may also override this with other cargo profiles to build for other feature sets
+              # for features configuration see `default` package which enables http3 by default
+
+              max-perf = default.override {
+                # compiles slower but with more thorough optimizations
+                profile = "release-max-perf";
+              };
+
+              max-perf-haswell = max-perf.override {
+                # compiles explicitly for haswell arch cpus
+                target_cpu = "haswell";
+              };
+            in
+            {
+              inherit default max-perf max-perf-haswell;
+
+            };
+        in
+        (mkPackages pkgs)
+        // (lib.mapAttrs' (name: value: lib.nameValuePair "${name}-static-x86_64" value) (
+          mkPackages (
+            import inputs.nixpkgs {
+              localSystem = system;
+              crossSystem = "x86_64-unknown-linux-musl";
+            }
+          )
+        ))
+        // (lib.mapAttrs' (name: value: lib.nameValuePair "${name}-static-aarch64" value) (
+          mkPackages (
+            import inputs.nixpkgs {
+              localSystem = system;
+              crossSystem = "aarch64-unknown-linux-musl";
+            }
+          )
+        ));
     };
 }