feat: add docker image builder

.github/workflows/image.yml

@@ -0,0 +1,25 @@
+name: Publish Docker Image
+
+on:
+  push:
+    tags:
+      - '**[0-9]+.[0-9]+.[0-9]+*'
+
+jobs:
+  build:
+    runs-on: ubuntu-24.04
+
+    permissions:
+      contents: read
+      id-token: write
+
+    env:
+      ACCESS_TOKEN: ${{ secrets.ACCESS_TOKEN }}
+
+    steps:
+      - uses: actions/checkout@v4
+      - uses: DeterminateSystems/nix-installer-action@main
+      - uses: DeterminateSystems/magic-nix-cache-action@main
+
+      - name: Deploy Docker Image
+        run: nix run .#deploy

flake.nix

@@ -60,6 +60,56 @@
         }
       );
 
+      packages = forAllSystems (
+        pkgs:
+        let
+          postgresql = pkgs.postgresql.dev;
+          cargo-pgrx = import ./nix/pgrx.nix { inherit pkgs; };
+
+          pname = "pglite-fusion";
+          version = "0.0.0";
+
+          postgres = pkgs.dockerTools.pullImage {
+            imageName = "postgres";
+            imageDigest = "sha256:026d0ab72b34310b68160ab9299aa1add5544e4dc3243456b94f83cb1c119c2c";
+            sha256 = "sha256-Bwd07vmTNRS1Ntd2sKvYXx/2GGaEVmGGjKukDmuSfD0=";
+          };
+
+          extension = pkgs.stdenv.mkDerivation {
+            inherit pname version;
+
+            src = import ./nix/build.nix { inherit pkgs cargo-pgrx postgresql; };
+
+            buildPhase = ''
+              install --directory $out/usr/share/postgresql/16/extension
+              cp -r $src/nix/store/wc1a06ip2fajrjkfbw7cvxzw1c949a6g-postgresql-16.4/share/postgresql/extension/* $out/usr/share/postgresql/16/extension
+              install --directory $out/usr/lib/postgresql/16/lib
+              cp -r $src/nix/store/wc1a06ip2fajrjkfbw7cvxzw1c949a6g-postgresql-16.4/lib/* $out/usr/lib/postgresql/16/lib
+            '';
+          };
+        in
+        rec {
+          image = pkgs.dockerTools.buildLayeredImage {
+            name = pname;
+            fromImage = postgres;
+
+            contents = [ extension ];
+            config = {
+              Env = [ "POSTGRES_HOST_AUTH_METHOD=trust" ];
+
+              Expose = 5432;
+              Cmd = [ "postgres" ];
+              Entrypoint = [ "docker-entrypoint.sh" ];
+            };
+          };
+
+          deploy = pkgs.writeShellScriptBin "deploy" ''
+            ${pkgs.skopeo}/bin/skopeo --insecure-policy copy docker-archive:${image} docker://docker.io/frectonz/${pname}:pg16-${version} --dest-creds="frectonz:$ACCESS_TOKEN"
+            ${pkgs.skopeo}/bin/skopeo --insecure-policy copy docker://docker.io/frectonz/${pname}:pg16-${version} docker://docker.io/frectonz/${pname}:latest --dest-creds="frectonz:$ACCESS_TOKEN"
+          '';
+        }
+      );
+
       formatter = forAllSystems (pkgs: pkgs.nixfmt-rfc-style);
     };
 }

nix/build.nix

@@ -0,0 +1,89 @@
+{
+  pkgs,
+  cargo-pgrx,
+  postgresql,
+}:
+
+let
+  postgresMajor = pkgs.lib.versions.major postgresql.version;
+
+  preBuildAndTest = ''
+    export PGRX_HOME=$(mktemp -d)
+    mkdir -p $PGRX_HOME/${postgresMajor}
+
+    cp -r -L ${postgresql}/. $PGRX_HOME/${postgresMajor}/
+    chmod -R ugo+w $PGRX_HOME/${postgresMajor}
+    cp -r -L ${postgresql.lib}/lib/. $PGRX_HOME/${postgresMajor}/lib/
+
+    ${cargo-pgrx}/bin/cargo-pgrx pgrx init \
+      --pg${postgresMajor} $PGRX_HOME/${postgresMajor}/bin/pg_config
+  '';
+
+  filterCargoSources =
+    orig_path: type:
+    let
+      path = (toString orig_path);
+      base = baseNameOf path;
+      parentDir = baseNameOf (dirOf path);
+
+      matchesSuffix = pkgs.lib.any (suffix: pkgs.lib.hasSuffix suffix base) [
+        ".rs"
+        ".toml"
+        ".control"
+      ];
+
+      # Cargo.toml already captured above
+      isCargoFile = base == "Cargo.lock";
+
+      # .cargo/config.toml already captured above
+      isCargoConfig = parentDir == ".cargo" && base == "config";
+    in
+    (type == "directory") || matchesSuffix || isCargoFile || isCargoConfig;
+in
+pkgs.rustPlatform.buildRustPackage {
+  pname = "pglite-fusion";
+  version = "0.0.0";
+
+  src = pkgs.lib.cleanSourceWith {
+    src = pkgs.lib.cleanSource ../.;
+    filter = filterCargoSources;
+  };
+  cargoLock.lockFile = ../Cargo.lock;
+
+  doCheck = false;
+  buildNoDefaultFeatures = true;
+  buildFeatures = [ "pg${postgresMajor}" ];
+
+  preBuild = preBuildAndTest;
+  preCheck = preBuildAndTest;
+  postPatch = "patchShebangs .";
+
+  postBuild = ''
+    if [ -f "pglite_fusion.control" ]; then
+      export NIX_PGLIBDIR=${postgresql.out}/share/postgresql/extension/
+      ${cargo-pgrx}/bin/cargo-pgrx pgrx package --pg-config ${postgresql}/bin/pg_config --out-dir the-thing
+      export NIX_PGLIBDIR=$PGRX_HOME/${postgresMajor}/lib
+    fi
+  '';
+
+  preFixup = ''
+    if [ -f "pglite_fusion.control" ]; then
+      ${cargo-pgrx}/bin/cargo-pgrx pgrx stop all
+      rm -rfv $out/target*
+    fi
+  '';
+
+  installPhase = ''
+    cp -rp the-thing $out
+  '';
+
+  nativeBuildInputs = [
+    postgresql
+    pkgs.rustfmt
+    postgresql.lib
+    pkgs.pkg-config
+    pkgs.rustPlatform.bindgenHook
+  ];
+
+  PGRX_PG_SYS_SKIP_BINDING_REWRITE = "1";
+}