Added Dockerfile

Dockerfile

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+ARG NGINX_TMP_INSTALL_DIR=/tmp/nginx-rtmp
+
+FROM alpine:latest as builder
+
+ENV NGINX_VERSION=1.18.0
+ENV NGINX_RTMP_MODULE_COMMIT=23ec4ce2d769830124abf3be1353dd9b105ab09c
+
+# Install dependencies
+RUN apk --update-cache add build-base openssl-dev pcre-dev zlib-dev
+
+# Download and extract nginx source
+RUN mkdir -p /tmp/build/nginx && \
+    cd /tmp/build/nginx && \
+    wget -O nginx.tar.gz https://nginx.org/download/nginx-${NGINX_VERSION}.tar.gz && \
+    tar -zxf nginx.tar.gz
+
+# Download and extract RTMP module source
+RUN mkdir -p /tmp/build/nginx-rtmp-module && \
+    cd /tmp/build/nginx-rtmp-module && \
+    wget -O module.zip https://github.com/sergey-dryabzhinsky/nginx-rtmp-module/archive/${NGINX_RTMP_MODULE_COMMIT}.zip && \
+    unzip module.zip
+
+# Build and install nginx in a specific directory in order to isolate it for later copy
+RUN cd /tmp/build/nginx/nginx-${NGINX_VERSION} && \
+    ./configure \
+        --sbin-path=/usr/local/sbin/nginx \
+        --pid-path=/var/run/nginx.pid \
+        --lock-path=/var/lock/nginx.lock \
+        --error-log-path=/var/log/nginx/error.log \
+        --http-log-path=/var/log/nginx/access.log \
+        --http-client-body-temp-path=/tmp/nginx-client-body \
+        --with-http_ssl_module \
+        --with-threads \
+        --add-module=/tmp/build/nginx-rtmp-module/nginx-rtmp-module-${NGINX_RTMP_MODULE_COMMIT} && \
+    make -j$(nproc) && \
+    make DESTDIR=${NGINX_TMP_INSTALL_DIR} install
+
+# Replace default with custom config
+COPY nginx.conf ${NGINX_TMP_INSTALL_DIR}/usr/local/nginx/conf/nginx.conf
+
+
+FROM alpine:latest
+
+# Copy installed nginx from previous stage
+COPY --from=builder ${NGINX_TMP_INSTALL_DIR} /
+
+CMD ["nginx", "-g", "daemon off;"]