add dockerfile, update libs

dockerfile

@@ -0,0 +1,16 @@
+FROM golang:1.22.0-alpine3.19 as build
+
+COPY src /src
+
+RUN cd /src \
+    && go build -o retrohub \
+    && mkdir -p ./fs/var/opt/retrohub \
+    && mkdir -p ./fs/opt/retrohub \
+    && cp retrohub ./fs/opt/retrohub/retrohub
+
+FROM scratch as prod
+
+COPY --from=build --chmod=755 /src/fs /
+
+EXPOSE 8080
+ENTRYPOINT [ "/opt/retrohub/retrohub", "-content", "/var/opt/retrohub/content.json" ]