Add devcontainer and dependabot configurations (#87)

.devcontainer/Dockerfile

@@ -0,0 +1,5 @@
+FROM mcr.microsoft.com/devcontainers/cpp:1-ubuntu-24.04
+
+# Install gcc 14
+COPY ./install-gcc.sh /tmp/
+RUN  chmod +x /tmp/install-gcc.sh && /tmp/install-gcc.sh && rm -f /tmp/install-gcc.sh

.devcontainer/devcontainer.json

@@ -0,0 +1,7 @@
+{
+	"name": "C++",
+	"build": {
+		"dockerfile": "Dockerfile"
+	},
+	"postCreateCommand": "git submodule init && git submodule update"
+}

.devcontainer/install-gcc.sh

@@ -0,0 +1,11 @@
+#!/usr/bin/env bash
+# Install gcc-14
+set -e
+
+apt-get update
+apt-get -y install software-properties-common
+add-apt-repository "deb http://archive.ubuntu.com/ubuntu/ noble main universe"
+apt-get update
+apt-get -y install gcc-14 g++-14
+update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-14 10
+update-alternatives --install /usr/bin/g++ g++ /usr/bin/g++-14 10

.github/dependabot.yml

@@ -0,0 +1,14 @@
+version: 2
+updates:
+ - package-ecosystem: "devcontainers"
+   directory: "/"
+   schedule:
+     interval: weekly
+ - package-ecosystem: "gitsubmodule"
+   directory: "/"
+   schedule:
+     interval: weekly
+ - package-ecosystem: "github-actions"
+   directory: "/"
+   schedule:
+     interval: weekly