First push

.dockerignore

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+*/.git/*

.gitlab-ci.yml

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+image: docker:latest
+
+stages:
+  - Build Base
+  - Push Images
+
+0-build-base:
+  stage: Build Base
+  artifacts:
+    expire_in: 1 week
+    paths:
+      - ./images/
+  tags:
+    - docker
+  before_script:
+    - mkdir ./images
+  script:
+    - docker build --pull -t "$CI_REGISTRY_IMAGE:$CI_COMMIT_SHORT_SHA" .
+    - docker save --output "./images/$CI_COMMIT_SHORT_SHA.tar" "$CI_REGISTRY_IMAGE:$CI_COMMIT_SHORT_SHA"
+
+1A-push-version:
+  stage: Push Images
+  dependencies:
+    - 0-build-base
+  tags:
+    - docker
+  when: manual
+  before_script:
+    - docker load --input "./images/$CI_COMMIT_SHORT_SHA.tar"
+    - docker load --input "./images/$CI_COMMIT_SHORT_SHA-git.tar"
+    - echo "$CI_REGISTRY_PASSWORD" | docker login -u "$CI_REGISTRY_USER" --password-stdin
+  script:
+    - docker tag "$CI_REGISTRY_IMAGE:$CI_COMMIT_SHORT_SHA" "$CI_REGISTRY_IMAGE:$CI_JOB_ID"
+    - docker push "$CI_REGISTRY_IMAGE:$CI_JOB_ID"
+
+1B-push-latest:
+  stage: Push Images
+  dependencies:
+    - 0-build-base
+  tags:
+    - docker
+  when: manual
+  before_script:
+    - docker load --input "./images/$CI_COMMIT_SHORT_SHA.tar"
+    - docker load --input "./images/$CI_COMMIT_SHORT_SHA-git.tar"
+    - echo "$CI_REGISTRY_PASSWORD" | docker login -u "$CI_REGISTRY_USER" --password-stdin
+  script:
+    - docker tag "$CI_REGISTRY_IMAGE:$CI_COMMIT_SHORT_SHA" "$CI_REGISTRY_IMAGE:latest"
+    - docker push "$CI_REGISTRY_IMAGE:latest"

Dockerfile

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+FROM nginx:1.16
+USER root
+WORKDIR /var/www
+
+# MySQL 5.7 (Homefully not version 8...)
+RUN apt-get update && apt-get install mysql-server -y
+
+# Configure NGINX
+ADD https://raw.githubusercontent.com/getgrav/grav/c381bc83040e00c9a8ebe91ac3bda5fe0c217197/webserver-configs/nginx.conf /etc/nginx/conf.d/default.conf
+RUN sed -i 's/root \/home\/USER\/www\/html/root \/var\/www/g' /etc/nginx/conf.d/default.conf \
+    && sed -i 's/fastcgi_pass unix:\/var\/run\/php\/php7.2-fpm.sock;/fastcgi_pass unix:\/var\/run\/php-fpm.sock;/g' /etc/nginx/conf.d/default.conf \
+    && sed -i 's/#listen 80;/listen 80;/g' /etc/nginx/conf.d/default.conf \
+    && sed -i '23cuser = nginx' /etc/php7/php-fpm.d/www.conf \
+    && sed -i '24cgroup = nginx' /etc/php7/php-fpm.d/www.conf \
+    && sed -i '47clisten.owner = nginx' /etc/php7/php-fpm.d/www.conf \
+    && sed -i '48clisten.group = nginx' /etc/php7/php-fpm.d/www.conf \
+    && sed -i '49clisten.mode = 0660' /etc/php7/php-fpm.d/www.conf \
+    && sed -i 's/listen = 127.0.0.1:9000/listen = \/var\/run\/php-fpm.sock/g' /etc/php7/php-fpm.d/www.conf
+
+COPY /entrypoint.sh /
+
+# Expose Insecure Web, MySQL Server
+EXPOSE 80 3306
+CMD ["/bin/sh", "/entrypoint.sh"]

entrypoint.sh

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+#!/bin/sh
+
+echo "[ INFO ] Recursively setting default nginx:nginx permissions on web directory"
+chown -R nginx:nginx /var/www
+
+echo "[ INFO ] Starting PHP-FPM"
+php-fpm7 -D # Background
+
+echo "[ INFO ] Starting cron"
+crond # Background
+
+echo "[ INFO ] Starting nginx"
+nginx -g "daemon off;" # Foreground