Add basic devcontainer configs

.devcontainer/Dockerfile

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+FROM debian:12
+
+ENV DEBIAN_FRONTEND=noninteractive
+
+RUN apt update \
+    && apt install -y \
+        libapache2-mod-php8.2 \
+        php8.2-cli \
+        php8.2-zip \
+        php8.2-xml \
+        php8.2-pgsql \
+        php8.2-mysql \
+        php8.2-sqlite3 \
+        php8.2-mcrypt \
+        php8.2-mbstring \
+        php8.2-ldap \
+        php8.2-gd \
+        php8.2-curl \
+        netcat-traditional \
+        curl \
+        sqlite3 \
+        default-mysql-client \
+        postgresql-client \
+        composer \
+        git \
+        zsh \
+        make \
+    && apt clean -y \
+    && chsh -s /bin/zsh \
+    && sh -c "$(curl -fsSL https://raw.githubusercontent.com/ohmyzsh/ohmyzsh/master/tools/install.sh)"

.devcontainer/devcontainer.json

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+{
+	"name": "Kanboard",
+	"build": {
+		"dockerfile": "Dockerfile"
+	},
+	"workspaceFolder": "/workspaces/${localWorkspaceFolderBasename}",
+
+	// For use with PHP or Apache (e.g.php -S localhost:8080 or apache2ctl start)
+	"forwardPorts": [
+        8080,
+		3306,
+        5432
+	],
+
+    // Features to add to the dev container. More info: https://containers.dev/features.
+	"features": {
+		"ghcr.io/devcontainers-contrib/features/gh-cli:1": {}
+	},
+
+    "portsAttributes": {
+        "8080": {
+            "label": "Application port"
+        },
+        "3306": {
+            "label": "MySQL port"
+        },
+        "5432": {
+            "label": "PostgreSQL port"
+        }
+	},
+	"customizations": {
+		"vscode": {
+			"extensions": [
+				"ms-azuretools.vscode-docker",
+				"zobo.php-intellisense",
+				"xdebug.php-debug",
+				"waderyan.gitblame",
+				"ms-vscode.makefile-tools",
+				"GitHub.copilot"
+			]
+		}
+	}
+}