Add Dockerfile (#111)

Reviewed-on: https://codeberg.org/Codeberg/pages-server/pulls/111
Reviewed-by: 6543 <6543@noreply.codeberg.org>
Co-authored-by: dorianim <mail@dorian.im>
Co-committed-by: dorianim <mail@dorian.im>

Dockerfile

@@ -0,0 +1,15 @@
+FROM golang:alpine as build
+
+WORKDIR /workspace
+
+RUN apk add ca-certificates
+COPY . .
+RUN CGO_ENABLED=0 go build .
+
+FROM scratch
+COPY --from=build /workspace/pages /pages
+COPY --from=build \
+    /etc/ssl/certs/ca-certificates.crt \
+    /etc/ssl/certs/ca-certificates.crt
+    
+ENTRYPOINT ["/pages"]