feat: add .devcontainer support

.devcontainer/cli/Dockerfile

@@ -0,0 +1,36 @@
+# From official php image.
+FROM php:8.3-cli-alpine
+# Create a user group and account under id 1000.
+RUN addgroup -g 1000 -S user && adduser -u 1000 -D user -G user
+# Install quality-of-life packages.
+RUN apk add --no-cache bash curl git vim
+# Install composer for php deps.
+RUN apk add --no-cache composer
+# Add Chromium and Image Magick for puppeteer.
+RUN apk add --no-cache \
+  imagemagick-dev \
+  chromium
+
+ENV PUPPETEER_EXECUTABLE_PATH=/usr/bin/chromium
+ENV PUPPETEER_DOCKER=1
+
+RUN mkdir -p /usr/src/php/ext/imagick
+RUN chmod 777 /usr/src/php/ext/imagick
+RUN curl -fsSL https://github.com/Imagick/imagick/archive/refs/tags/3.7.0.tar.gz | tar xvz -C "/usr/src/php/ext/imagick" --strip 1
+
+# Install PHP extensions
+RUN docker-php-ext-install imagick
+
+# Composer uses its php binary, but we want it to use the container's one
+RUN rm -f /usr/bin/php83
+RUN ln -s /usr/local/bin/php /usr/bin/php83
+# Install postgres pdo driver.
+# RUN apk add --no-cache postgresql-dev && docker-php-ext-install pdo_pgsql
+# Install redis driver.
+# RUN mkdir -p /usr/src/php/ext/redis; \
+#     curl -fsSL --ipv4 https://github.com/phpredis/phpredis/archive/6.0.2.tar.gz | tar xvz -C "/usr/src/php/ext/redis" --strip 1; \
+#     docker-php-ext-install redis
+# Install nodejs and npm for frontend.
+RUN apk add --no-cache nodejs npm
+# Prevent container from exiting early.
+CMD ["sleep", "infinity"]