Created shell devcontainer for a reproducable build environment

.devcontainer/Dockerfile

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+FROM docker.io/gotify/build:1.25.1-linux-amd64
+
+ENV NVM_DIR /root/.nvm
+ENV NODE_VERSION 22
+
+RUN curl -o- https://raw.githubusercontent.com/nvm-sh/nvm/v0.40.3/install.sh | bash \
+    && . $NVM_DIR/nvm.sh \
+    && nvm install 22 \
+    && npm install --global yarn

.devcontainer/config-environment.sh

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+#!/bin/bash
+
+make download-tools
+go get
+
+cd ui
+yarn

.devcontainer/devcontainer.json

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+{
+	"name": "Gotify Server",
+	//Need to customize the docker build container to add misisng tools (nvm, npm, yarn)
+	"build": {
+		"dockerfile": "Dockerfile"
+	},
+
+	"containerEnv": {
+		"GOTIFY_SERVER_PORT": "8080"
+	},
+
+	// Download required toolchains with `make` and `yarn`
+	"postCreateCommand": "bash .devcontainer/config-environment.sh"
+}