Add Alpine based Docker image (#317)

docker/alpine.Dockerfile

@@ -0,0 +1,75 @@
+# Based on:
+# https://hg.nginx.org/pkg-oss/file/tip/alpine/Makefile
+# /~https://github.com/nginxinc/docker-nginx/blob/master/mainline/alpine/Dockerfile
+FROM alpine:3.14
+
+LABEL maintainer="Kleis Auke Wolthuizen <info@kleisauke.nl>"
+
+ARG NGINX_VERSION=1.21.3
+
+# Copy the contents of this repository to the container
+COPY . /var/www/imagesweserv
+WORKDIR /var/www/imagesweserv
+
+# Set default timezone (can be overridden with -e "TZ=Continent/City")
+ENV TZ=Europe/Amsterdam \
+    # Increase the minimum stack size to 2MB
+    VIPS_MIN_STACK_SIZE=2m
+
+# The latest libvips can be installed from edge
+ARG ALPINE_REPO=https://dl-cdn.alpinelinux.org/alpine/edge/community
+
+# Create nginx user/group first, to be consistent throughout docker variants
+RUN addgroup -g 101 -S nginx \
+    && adduser -S -D -H -u 101 -h /var/cache/nginx -s /sbin/nologin -G nginx -g nginx nginx \
+    # Bring in build dependencies
+    && apk add --no-cache --virtual .build-deps --repository $ALPINE_REPO \
+        build-base \
+        cmake \
+        git \
+        openssl-dev \
+        pcre-dev \
+        vips-dev \
+    # Build CMake-based project
+    && cmake -B_build -H. \
+        -DCMAKE_BUILD_TYPE=Release \
+        -DBUILD_TOOLS=ON \
+        -DNGX_VERSION=$NGINX_VERSION \
+        -DCUSTOM_NGX_FLAGS="--prefix=/etc/nginx;\
+--sbin-path=/usr/sbin/nginx;\
+--modules-path=/usr/lib/nginx/modules;\
+--conf-path=/etc/nginx/nginx.conf;\
+--error-log-path=/var/log/nginx/error.log;\
+--http-log-path=/var/log/nginx/access.log;\
+--http-client-body-temp-path=/var/cache/nginx/client_temp;\
+--http-proxy-temp-path=/var/cache/nginx/proxy_temp;\
+--http-fastcgi-temp-path=/var/cache/nginx/fastcgi_temp;\
+--http-uwsgi-temp-path=/var/cache/nginx/uwsgi_temp;\
+--http-scgi-temp-path=/var/cache/nginx/scgi_temp;\
+--pid-path=/var/run/nginx.pid;\
+--lock-path=/var/run/nginx.lock;\
+--user=nginx;\
+--group=nginx" \
+    && make -C _build -j"$(nproc)" \
+    # Remove build directory and dependencies
+    && rm -rf _build \
+    && apk del .build-deps \
+    # Bring in runtime dependencies
+    && apk add --no-cache --repository $ALPINE_REPO \
+        openssl \
+        pcre \
+        vips \
+    # Bring in tzdata so users could set the timezones through the environment
+    # variables
+    && apk add --no-cache tzdata \
+    # Forward request and error logs to docker log collector
+    && ln -sf /dev/stdout /var/log/nginx/weserv-access.log \
+    && ln -sf /dev/stderr /var/log/nginx/weserv-error.log \
+    # Copy nginx configuration to the appropriate location
+    && cp ngx_conf/*.conf /etc/nginx
+
+EXPOSE 80
+
+STOPSIGNAL SIGQUIT
+
+CMD ["nginx", "-g", "daemon off;"]