chore: write dockerfiles for agent and backend

agent/dockerfile

@@ -0,0 +1,26 @@
+FROM golang:1.26.1 as builder
+
+WORKDIR /app
+
+COPY go.mod go.sum ./
+RUN --mount=type=cache,target=/go/pkg/mod \
+  --mount=type=cache,target=/root/.cache/go-build \
+  go mod download
+
+COPY . .
+ENV CGO_ENABLED=0
+RUN --mount=type=cache,target=/go/pkg/mod \
+  --mount=type=cache,target=/root/.cache/go-build \
+  go build -ldflags "-s -w" -o agent ./cmd/main.go
+
+FROM debian:bookworm-slim
+
+RUN apt-get update && apt-get install -y --no-install-recommends \
+  systemd \
+  && rm -rf /var/lib/apt/lists/*
+
+WORKDIR /app
+
+COPY --from=builder /app/agent .
+
+CMD ["./agent"]

backend/dockerfile

@@ -0,0 +1,24 @@
+FROM golang:1.26.1 as builder
+
+WORKDIR /app
+
+COPY . .
+ENV CGO_ENABLED=0
+ENV GIN_MODE=release
+RUN --mount=type=cache,target=/go/pkg/mod \
+  --mount=type=cache,target=/root/.cache/go-build \
+  go mod download && \
+  go build -ldflags "-s -w" -o backend ./cmd/main.go
+
+FROM alpine:3.23.0
+
+RUN apk add --no-cache curl openssl bash
+
+COPY --from=builder /app/backend .
+COPY --from=builder /app/scripts /etc/mnemosyne/scripts
+RUN chmod +x /etc/mnemosyne/scripts/generate-certs.sh
+
+EXPOSE 8080
+HEALTHCHECK --interval=30s --timeout=30s --start-period=5s --retries=3 CMD [ "curl --fail http://localhost:8080/health" ]
+
+CMD ["./backend"]