build(docker): add Dockerfile

Dockerfile

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+FROM rust:1.83-alpine3.20 AS builder
+
+WORKDIR /usr/src/minauthator
+COPY . .
+
+RUN apk add musl-dev
+
+RUN cargo install --bin minauthator-admin --locked --path lib/admin_cli
+RUN cargo install --bin minauthator-server --locked --path lib/http_server
+
+FROM alpine:3.20 AS base
+
+RUN apk add sqlite
+COPY --from=builder /usr/local/cargo/bin/minauthator-server /usr/local/bin/minauthator-server
+COPY --from=builder /usr/local/cargo/bin/minauthator-admin /usr/local/bin/minauthator-admin
+RUN mkdir -p \
+    /usr/local/src/minauthator/migrations \
+    /usr/local/lib/minauthator/assets \
+    /var/lib/minauthator \
+    /etc/minauthator
+COPY --from=builder /usr/src/minauthator/migrations/all.sql /usr/local/src/minauthator/migrations
+COPY --from=builder /usr/src/minauthator/init_db.sh /usr/local/bin/minauthator_init_db.sh
+COPY --from=builder /usr/src/minauthator/assets /usr/local/lib/minauthator/assets
+
+RUN addgroup -g 1000 app && \
+    adduser -S -u 1000 -G app -s /bin/sh app && \
+    chown -R app:app /var/lib/minauthator && \
+    chmod -R u=rwx,g=rwx,o= /var/lib/minauthator
+
+USER app:app
+ENV RUST_LOG=info
+ENV RUST_BACKTRACE=1
+ENV APP_JWT_SECRET="DummyAppSecret20241029"
+
+CMD ["minauthator-server", "--listen-host", "0.0.0.0", "--listen-port", "8080"]
+
+