chore: Dockerize

.dockerignore

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+/target
+.history/

Dockerfile

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+ARG RUST_TAG=1.94.1-alpine3.23
+FROM rust:${RUST_TAG} AS builder
+
+ARG BUILD_BASE_VERSION=0.5-r3
+RUN --mount=type=cache,sharing=locked,target=/var/cache/apk \
+    apk add --update build-base=${BUILD_BASE_VERSION}
+
+ARG CMAKE_VERSION=4.1.3-r0
+RUN --mount=type=cache,sharing=locked,target=/var/cache/apk \
+    apk add --update cmake=${CMAKE_VERSION}
+
+ARG PROTOC_VERSION=31.1-r1
+RUN --mount=type=cache,sharing=locked,target=/var/cache/apk \
+    apk add --update protoc=${PROTOC_VERSION}
+
+RUN \
+    # This one would be nice if it worked:
+    # --mount=type=bind,source=.,target=/root/app \
+    # Use this one if there's a hard to track down "read-only filesystem" error:
+    --mount=type=bind,source=.,target=/root/app,rw \
+
+    # --mount=type=bind,source=./target,target=/root/app/target,rw \
+    --mount=type=cache,sharing=private,target=/root/app/target \
+    # --mount=type=cache,sharing=private,target=/root/app/target,uid=1000,gid=1000 \
+    --mount=type=cache,target=/usr/local/cargo/git/db \
+    --mount=type=cache,target=/usr/local/cargo/registry/ \
+    cd /root/app && \
+    cargo build --release && \
+    cp target/release/fomo-reducer /root/program
+
+FROM scratch AS runner
+
+COPY --from=builder /root/program /program
+
+ENTRYPOINT ["/program"]