Added running unciv in docker (#7031)

.dockerignore

@@ -0,0 +1,3 @@
+.git
+Dockerfile
+docker-compose.yml

Dockerfile

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+
+ARG ARG_COMPILE_BASE_IMAGE=accetto/ubuntu-vnc-xfce-opengl-g3
+FROM $ARG_COMPILE_BASE_IMAGE as build
+USER root
+RUN  apt update && \
+        apt upgrade -y && \
+        apt install --fix-broken -y wget curl default-jre default-jdk
+WORKDIR /src
+# Get dependencies
+RUN wget -q -O packr-all-4.0.0.jar https://github.com/libgdx/packr/releases/download/4.0.0/packr-all-4.0.0.jar && \
+    wget -q -O jre-linux-64.tar.gz https://github.com/AdoptOpenJDK/openjdk11-binaries/releases/download/jdk-11.0.11%2B9/OpenJDK11U-jre_x64_linux_hotspot_11.0.11_9.tar.gz
+
+# https://nieldw.medium.com/caching-gradle-binaries-in-a-docker-build-when-using-the-gradle-wrapper-277c17e7dd22
+# Get gradle distribution 
+COPY *.gradle gradle.* gradlew /src/
+COPY gradle /src/gradle
+WORKDIR /src
+RUN ./gradlew --version
+
+# Build unciv
+COPY . /src/
+RUN ./gradlew classes
+RUN ./gradlew desktop:packrLinux64 --stacktrace --info --daemon --scan
+RUN ./gradlew desktop:zipLinuxFilesForJar
+
+FROM accetto/ubuntu-vnc-xfce-opengl-g3 as run
+WORKDIR /home/headless/Desktop/
+COPY --chown=1001:1001 --from=build /src/desktop/packr/* /usr/
+COPY --chown=1001:1001 --from=build /src/desktop/packr/Unciv.jar /usr/share/Unciv/Unciv.jar
+COPY --chown=1001:1001 --from=build /src/desktop/linuxFilesForJar/* /home/headless/Desktop/
+RUN chmod +x Unciv.sh
+USER 1001

README.md

@@ -125,5 +125,15 @@ Single player does not use this feature.
 
 | [![](https://static.itch.io/images/badge.svg)](https://yairm210.itch.io/unciv)    |    [![](https://play.google.com/intl/en_us/badges/images/generic/en-play-badge.png)](https://play.google.com/store/apps/details?id=com.unciv.app)   |    [![](https://fdroid.gitlab.io/artwork/badge/get-it-on.png)](https://f-droid.org/en/packages/com.unciv.app/)	| [![](https://flathub.org/assets/badges/flathub-badge-en.svg)](https://flathub.org/apps/details/io.github.yairm210.unciv)  
 |---	|---	|---	|---	|
+## Run with Docker
+
+If you have docker and docker-compose installed, you can:
+
+* Run ```$ docker-compose build && docker-compose up```
+* Open http://localhost:6901/vnc.html?password=headless
+
+And if you are using docker desktop:
+* ```$ docker compose build && docker compose up```
+* http://localhost:6901/vnc.html?password=headless
 
 # [Credits and 3rd parties](docs/Credits.md)

docker-compose.yml

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+version: "3.6"
+services:
+  unciv:
+    build: .
+    ports:
+      - "6901:6901"
+      - "5901:5901"
+    command: /home/headless/Desktop/Unciv.sh