refactor: update Dockerfile for Ubuntu 18.04, 20.04, and 22.04

- Refactored the Dockerfile for Ubuntu 18.04, 20.04, and 22.04.
- Replaced `wget` with `curl` to download linuxgsm.sh.
- Updated package installation by replacing `vim` with `nvim`.
- Updated README.md to reflect changes in the base LinuxGSM image.

Co-authored-by: [Author Name]

Dockerfile.ubuntu-1804

@@ -102,7 +102,7 @@ HEALTHCHECK --interval=1m --timeout=1m --start-period=2m --retries=1 CMD /app/en
 ## Download linuxgsm.sh
 RUN echo "**** Download linuxgsm.sh ****" \
   && set -ex \
-  && wget -O linuxgsm.sh "https://raw.githubusercontent.com/GameServerManagers/LinuxGSM/${LGSM_GITHUBBRANCH}/linuxgsm.sh" \
+  && curl -Lo linuxgsm.sh "https://raw.githubusercontent.com/GameServerManagers/LinuxGSM/${LGSM_GITHUBBRANCH}/linuxgsm.sh" \
   && chmod +x linuxgsm.sh
 
 RUN echo "**** Get LinuxGSM Modules ****" \

Dockerfile.ubuntu-2004

@@ -102,7 +102,7 @@ HEALTHCHECK --interval=1m --timeout=1m --start-period=2m --retries=1 CMD /app/en
 ## Download linuxgsm.sh
 RUN echo "**** Download linuxgsm.sh ****" \
   && set -ex \
-  && wget -O linuxgsm.sh "https://raw.githubusercontent.com/GameServerManagers/LinuxGSM/${LGSM_GITHUBBRANCH}/linuxgsm.sh" \
+  && curl -Lo linuxgsm.sh "https://raw.githubusercontent.com/GameServerManagers/LinuxGSM/${LGSM_GITHUBBRANCH}/linuxgsm.sh" \
   && chmod +x linuxgsm.sh
 
 RUN echo "**** Get LinuxGSM Modules ****" \

Dockerfile.ubuntu-2204

@@ -61,7 +61,7 @@ RUN echo "**** Install Base LinuxGSM Requirements ****" \
   iproute2 \
   iputils-ping \
   nano \
-  vim \
+  nvim \
   && apt-get -y autoremove \
   && apt-get -y clean \
   && rm -rf /var/lib/apt/lists/* \
@@ -102,7 +102,7 @@ HEALTHCHECK --interval=1m --timeout=1m --start-period=2m --retries=1 CMD /app/en
 ## Download linuxgsm.sh
 RUN echo "**** Download linuxgsm.sh ****" \
   && set -ex \
-  && wget -O linuxgsm.sh "https://raw.githubusercontent.com/GameServerManagers/LinuxGSM/${LGSM_GITHUBBRANCH}/linuxgsm.sh" \
+  && curl -o linuxgsm.sh "https://raw.githubusercontent.com/GameServerManagers/LinuxGSM/${LGSM_GITHUBBRANCH}/linuxgsm.sh" \
   && chmod +x linuxgsm.sh
 
 RUN echo "**** Get LinuxGSM Modules ****" \

README.md

@@ -1,4 +1,4 @@
-# LinuxGSM Docker Image
+# LinuxGSM Base Docker Image
 
 ## This is the base LinuxGSM image only.
 ## Use <a href="https://github.com/GameServerManagers/docker-gameserver">docker-gameserver</a> for full game servers