add dockerfile

Signed-off-by: Tobias Erbshäußer <tobias@tesoft.dev>

Dockerfile

@@ -0,0 +1,31 @@
+FROM golang:1.26.3-alpine3.22 AS backendBuilder
+
+RUN apk add --no-cache gcc g++
+
+COPY ./backend /source
+
+RUN cd /source && \
+    CGO_ENABLED=1 go build
+
+FROM node:22.22.3-trixie AS frontendBuilder
+
+COPY ./frontend /source
+
+RUN cd /source && \
+    rm -rf ./dist ./distMinified ./node_modules && \
+    npm install --ignore-scripts && \
+    npm run build
+
+FROM alpine:3.22.4
+
+RUN mkdir -p /website
+
+COPY --from=backendBuilder /source/backend /website/server
+COPY --from=frontendBuilder /source/distMinified /website/static
+
+ENV PORT=80
+ENV FRONTEND_PATH=/website/static
+
+EXPOSE 80
+
+ENTRYPOINT ["/website/server"]