feat(homeserver): add dockerfile

.dockerignore

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+/target
+/docs
+/.github

Dockerfile

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+# ========================
+# Build Stage
+# ========================
+FROM rust:1.81.0-alpine3.20 AS builder
+
+# Install build dependencies, including static OpenSSL libraries
+RUN apk add --no-cache \
+    musl-dev \
+    openssl-dev \
+    openssl-libs-static \
+    pkgconfig \
+    build-base \
+    curl
+
+# Set environment variables for static linking with OpenSSL
+ENV OPENSSL_STATIC=yes
+ENV OPENSSL_LIB_DIR=/usr/lib
+ENV OPENSSL_INCLUDE_DIR=/usr/include
+
+# Add the MUSL target for static linking
+RUN rustup target add x86_64-unknown-linux-musl
+
+# Set the working directory
+WORKDIR /usr/src/app
+
+# Copy over Cargo.toml and Cargo.lock for dependency caching
+COPY Cargo.toml Cargo.lock ./
+
+# Copy over all the source code
+COPY . .
+
+# Build the project in release mode for the MUSL target
+RUN cargo build --release --bin pubky_homeserver --target x86_64-unknown-linux-musl
+
+# Strip the binary to reduce size
+RUN strip target/x86_64-unknown-linux-musl/release/pubky_homeserver
+
+# ========================
+# Runtime Stage
+# ========================
+FROM alpine:3.20
+
+# Install runtime dependencies (only ca-certificates)
+RUN apk add --no-cache ca-certificates
+
+# Copy the compiled binary from the builder stage
+COPY --from=builder /usr/src/app/target/x86_64-unknown-linux-musl/release/pubky_homeserver /usr/local/bin/homeserver
+
+# Set the working directory
+WORKDIR /usr/local/bin
+
+# Expose the port the homeserver listens on (should match that of config.toml)
+EXPOSE 6287
+
+# Set the default command to run the homeserver binary
+CMD ["homeserver"]