optimize meilisearch uffizzi build

even though docker cache was being used earlier for uffizzi builds,
seems like the cache layers weren't persisting. This commit adds changes
to move meilisearch building outside the dockerfile so that we can
use the rust cache action. We are also building to the musl target
so that the binary for meilisearch which is created can be used for
the uffizzi ttyd image which uses alpine.

.github/uffizzi/Dockerfile

@@ -1,24 +1,3 @@
-# Compile
-FROM    rust:alpine3.16 AS compiler
-
-RUN     apk add -q --update-cache --no-cache build-base openssl-dev
-
-WORKDIR /meilisearch
-
-ARG     COMMIT_SHA
-ARG     COMMIT_DATE
-ARG     GIT_TAG
-ENV     COMMIT_SHA=${COMMIT_SHA} COMMIT_DATE=${COMMIT_DATE} VERGEN_GIT_SEMVER_LIGHTWEIGHT=${GIT_TAG}
-ENV     RUSTFLAGS="-C target-feature=-crt-static"
-
-COPY    . .
-RUN     set -eux; \
-        apkArch="$(apk --print-arch)"; \
-        if [ "$apkArch" = "aarch64" ]; then \
-            export JEMALLOC_SYS_WITH_LG_PAGE=16; \
-        fi && \
-        cargo build --release
-
 # Run
 FROM    uffizzi/ttyd:alpine
 
@@ -29,19 +8,11 @@ ENV     MEILI_NO_ANALYTICS true
 RUN     apk update --quiet \
         && apk add -q --no-cache libgcc tini curl
 
-# add meilisearch to the `/bin` so you can run it from anywhere and it's easy
-# to find.
-COPY    --from=compiler /meilisearch/target/release/meilisearch /bin/meilisearch
-# To stay compatible with the older version of the container (pre v0.27.0) we're
-# going to symlink the meilisearch binary in the path to `/meilisearch`
+COPY    target/x86_64-unknown-linux-musl/release/meilisearch /bin/meilisearch
 RUN     ln -s /bin/meilisearch /meilisearch
 
-# This directory should hold all the data related to meilisearch so we're going
-# to move our PWD in there.
-# We don't want to put the meilisearch binary
 WORKDIR /meili_data
 
-
 EXPOSE  7700/tcp
 
 ENTRYPOINT ["tini", "--"]