build: Added Dockerfile

.dockerignore

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+.github/
+api/

Dockerfile

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+# syntax=docker/dockerfile:1
+FROM golang:1.23-alpine3.21 AS build
+WORKDIR /repo
+ENV CGO_ENABLED=0 GOOS=linux GOARCH=amd64
+COPY go.mod go.sum ./
+RUN go mod download
+COPY . .
+RUN go build -ldflags="-s -w" -o ./bin/server ./cmd/server
+
+FROM gcr.io/distroless/static-debian12:nonroot
+WORKDIR /bin
+USER nonroot:nonroot
+EXPOSE 80 443
+COPY --from=build /repo/env.local.yaml ./
+COPY --from=build /repo/bin/server ./
+ENTRYPOINT [ "/bin/server" ]