Remove alpine dockerfile and rename scratch.dockerfile to Dockerfile

I've given up.

Signed-off-by: trivernis <trivernis@protonmail.com>

alpine.dockerfile

@@ -1,18 +0,0 @@
-FROM alpine AS builder
-RUN apk add --no-cache build-base cargo
-WORKDIR /usr/src
-RUN USER=root cargo new snekcloud-server
-WORKDIR /usr/src/snekcloud-server
-COPY Cargo.toml Cargo.lock ./
-COPY src ./src
-RUN cargo build --release
-WORKDIR target/release/
-RUN ./snekcloud-server generate-key private_key
-RUN timeout 1s ./snekcloud-server || exit 0
-RUN cp config/00_default.toml config/10_local.toml
-
-FROM alpine
-COPY --from=builder /usr/src/snekcloud-server/target/release/snekcloud-server .
-COPY --from=builder /usr/src/snekcloud-server/target/release/config /
-COPY --from=builder /usr/src/snekcloud-server/target/release/private_key /
-ENTRYPOINT ["./snekcloud-server"]