Added most basic postgresql

Changelog: added
Signed-off-by: GeorgeRaven <GeorgeRavenCommunity@pm.me>

.gitignore

@@ -1 +1,2 @@
 **result
+**result-*

containers/postgresql/.dockerignore

@@ -0,0 +1,2 @@
+result
+Dockerfile

containers/postgresql/Dockerfile

@@ -0,0 +1,31 @@
+# https://mitchellh.com/writing/nix-with-dockerfiles
+ARG GID="1000"
+ARG UID="1000"
+ARG SRC_DIR="."
+ARG PKG_DIR="/app"
+ARG NIX_STORE_DIR="/nix/store"
+
+FROM harbor.deepcypher.me/docker.io/nixos/nix:2.32.1 AS builder
+ARG SRC_DIR \
+    PKG_DIR
+WORKDIR ${PKG_DIR}
+COPY ${SRC_DIR} ${PKG_DIR}
+RUN nix  \
+    --extra-experimental-features "nix-command flakes" \
+    --option filter-syscalls false \
+    build
+RUN mkdir /tmp/nix-store-closure && \
+    cp -R $(nix-store --query --requisites result/) /tmp/nix-store-closure && \
+    ls -alh /tmp/nix-store-closure
+
+FROM scratch
+ARG PKG_DIR \
+    UID \
+    GID
+ENV PKG_DIR=${PKG_DIR} \
+    PATH=${PKG_DIR}/bin:${PATH}
+COPY --from=builder /tmp/nix-store-closure /nix/store
+COPY --from=builder ${PKG_DIR}/result ${PKG_DIR}
+USER ${UID}:${GID}
+WORKDIR ${PKG_DIR}
+CMD ["postgres"]

containers/postgresql/flake.nix

@@ -1,23 +1,28 @@
 {
-  description = "A flake to build and provide a postgresql environment";
+  description = "Basic postgresql flake";
 
   inputs = {
     nixpkgs.url = "github:nixos/nixpkgs/release-25.05";
     flake-utils.url = "github:numtide/flake-utils";
+    # force subflake dependencies to follow nixpkgs version
+    # of parent flake
+    # flake-utils.inputs.nixpkgs.follows = "nixpkgs";
   };
 
   outputs =
     {
       self,
       nixpkgs,
-      flake-utils,
-    }:
-    flake-utils.lib.eachDefaultSystem (
+      ...
+    }@inputs:
+    inputs.flake-utils.lib.eachDefaultSystem (
       system:
       let
         pkgs = import nixpkgs { inherit system; };
       in
       {
+        packages.postgresql = pkgs.postgresql;
+        packages.default = self.packages.${system}.postgresql;
         # nix fmt formatter option attributes
         formatter = pkgs.nixfmt-tree;
       }