sccache: Fix installation script for musl sccache

Signed-off-by: Daniel Silverstone <dsilvers@digital-scurf.org>

Author: kinnison

ci/docker/scripts/sccache.bash

@@ -8,12 +8,13 @@ SHA="26fd04c1273952cc2a0f359a71c8a1857137f0ee3634058b3f4a63b69fc8eb7f"
 DL_URL="https://github.com/mozilla/sccache/releases/download"
 BIN_DIR=/usr/local/bin
 TEMP_DIR=$(mktemp -d)
+TAR_NAME="sccache-${VERSION}-${TARGET}.tar.gz"
 
 cd "${TEMP_DIR}"
 mkdir -p "${BIN_DIR}"
 
-curl -sSL -O "${DL_URL}/${VERSION}/sccache-${VERSION}-${TARGET}.tar.gz"
-echo "${SHA}  sccache-${VERSION}-${TARGET}.tar.gz" | sha256sum --check -
-tar -xzf - --strip-components 1
+curl -sSL -O "${DL_URL}/${VERSION}/${TAR_NAME}"
+echo "${SHA}  ${TAR_NAME}" | sha256sum --check -
+tar -xzf "${TAR_NAME}" --strip-components 1
 cp sccache "${BIN_DIR}/sccache"
 chmod +x "${BIN_DIR}/sccache"