Starting my own using Evns' version - Credit to them for their work

Dockerfile

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+FROM nginx:1.11.9
+
+# Desired version of grav
+ARG GRAV_VERSION=1.1.16
+
+# Install dependencies
+RUN apt-get update && \
+    apt-get install -y sudo wget vim unzip php5 php5-curl php5-gd php-pclzip php5-fpm
+ADD https://github.com/krallin/tini/releases/download/v0.13.2/tini /usr/local/bin/tini
+RUN chmod +x /usr/local/bin/tini
+
+# Set user to www-data
+RUN mkdir -p /var/www && chown www-data:www-data /var/www
+USER www-data
+
+# Install grav
+WORKDIR /var/www
+RUN wget https://github.com/getgrav/grav/releases/download/$GRAV_VERSION/grav-admin-v$GRAV_VERSION.zip && \
+    unzip grav-admin-v$GRAV_VERSION.zip && \
+    rm grav-admin-v$GRAV_VERSION.zip && \
+    cd grav-admin && \
+    bin/gpm install -f -y admin
+
+# Return to root user
+USER root
+
+# Install Acmetool Let's Encrypt client
+RUN echo 'deb http://ppa.launchpad.net/hlandau/rhea/ubuntu xenial main' > /etc/apt/sources.list.d/rhea.list \
+    && apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 9862409EF124EC763B84972FF5AC9651EDB58DFA \
+    && apt-get update \
+    && apt-get install acmetool
+
+# Configure nginx with grav
+WORKDIR grav-admin
+RUN cd webserver-configs && \
+    sed -i 's/root \/home\/USER\/www\/html/root \/var\/www\/grav-admin/g' nginx.conf && \
+    cp nginx.conf /etc/nginx/conf.d/default.conf
+
+# Set the file permissions
+RUN usermod -aG www-data nginx
+
+# Run startup script
+ADD resources /
+ENTRYPOINT [ "/usr/local/bin/tini", "--", "/usr/local/bin/startup.sh" ]

README.md

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 # Grav on Docker
 
+[https://github.com/evnsio/grav]