ci: add Dockerfile

.dockerignore

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+.git/
+Dockerfile
+bin/

Dockerfile

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+FROM golang:1.24-alpine AS build
+WORKDIR /app/
+COPY go.mod go.sum ./
+RUN go mod download
+COPY . .
+RUN CGO_ENABLED=0 GOOS=linux go build -o bin/urbanterror-agones ./cmd/urbanterror-agones/
+
+FROM alpine:3
+WORKDIR /app/
+COPY --from=build /app/bin/urbanterror-agones ./
+ENTRYPOINT ["/app/urbanterror-agones"]