Add dev container (#171)

* Create devcontainer.json
* Create docker-compose.yml
* Create .env
* Create dockerfile

Author: VerifiedJoseph

.devcontainer/.env

@@ -0,0 +1,2 @@
+GOTIFY_URI=http://gotify
+HTTPBIN_URI=http://httpbin

.devcontainer/devcontainer.json

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+{
+    "name": "gotify-api-php-dev-container",
+    "dockerComposeFile": [
+        "docker-compose.yml"
+    ],
+    "service": "workspace",
+    "workspaceFolder": "/gotify-api-php",
+    "extensions": [
+        "EditorConfig.EditorConfig",
+        "streetsidesoftware.code-spell-checker",
+        "bmewburn.vscode-intelephense-client",
+        "recca0120.vscode-phpunit"
+    ],
+    "postStartCommand": "git config --global --add safe.directory ${containerWorkspaceFolder}"
+}

.devcontainer/docker-compose.yml

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+services:
+  workspace:
+    container_name: workspace
+    build:
+      context: ./docker/workspace
+    tty: true
+    volumes:
+      - ../:/gotify-api-php
+    working_dir: /gotify-api-php
+    environment:
+      - GOTIFY_URI=${GOTIFY_URI}
+      - HTTPBIN_URI=${HTTPBIN_URI}
+
+  gotify:
+    container_name: gotify
+    image: gotify/server:2.2.2
+    ports:
+      - "8080:80"
+    environment:
+      - GOTIFY_DEFAULTUSER_NAME=admin
+      - GOTIFY_DEFAULTUSER_PASS=admin
+      - GOTIFY_DATABASE_DIALECT=sqlite3
+      - GOTIFY_DATABASE_CONNECTION=/app/gotify.db
+
+  httpbin:
+    container_name: httpbin
+    image: kennethreitz/httpbin
+    ports:
+      - "8081:80"

.devcontainer/docker/workspace/dockerfile

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+FROM php:8.1-alpine3.17
+
+ENV COMPOSER_ALLOW_SUPERUSER 1
+
+COPY --from=composer:2.5.1 /usr/bin/composer /usr/bin/composer
+
+# Install packages
+RUN apk add --no-cache git