Add basic action

Dockerfile

@@ -0,0 +1,17 @@
+# Container image that runs your code
+FROM alpine:3.17
+
+RUN apk add --no-cache curl tar
+
+ARG RCON_VERSION="0.10.2"
+
+RUN curl -LO https://github.com/gorcon/rcon-cli/releases/download/v${RCON_VERSION}/rcon-${RCON_VERSION}-amd64_linux.tar.gz && \
+    tar -xvf rcon-${RCON_VERSION}-amd64_linux.tar.gz && \
+    mv rcon-${RCON_VERSION}-amd64_linux/rcon /usr/local/bin/ && \
+    rm -rf rcon-${RCON_VERSION}-amd64_linux*
+
+# Copies your code file from your action repository to the filesystem path `/` of the container
+COPY entrypoint.sh /entrypoint.sh
+
+# Code file to execute when the docker container starts up (`entrypoint.sh`)
+ENTRYPOINT ["/entrypoint.sh"]