build: dockerize the project

Dockerfile

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+FROM rust:1.87-alpine3.21 AS base 
+
+ARG CARGO_FEATURES="blog"
+
+FROM base AS install
+WORKDIR /temp/dev
+COPY Cargo.toml Cargo.lock .
+RUN mkdir .cargo && cargo vendor --locked >> .cargo/config.toml
+
+FROM base AS builder
+WORKDIR /usr/src/app
+COPY --from=install /temp/dev/vendor /temp/dev/.cargo .
+COPY . .
+RUN cargo build --release --no-default-features --features $CARGO_FEATURES
+
+FROM base AS runner
+USER runner
+EXPOSE 80/tcp 22/tcp
+COPY --from=builder /usr/src/app/target/release/ssh-portfolio /usr/local/bin/ssh-portfolio
+
+CMD ["/usr/local/bin/ssh-portfolio"]