fix(install): switch to install the musl binaries by default (#1590)

We have had a few issues where users haave run the install script and
have ended up with a non-functioning version of starship because their
system doesn't have a required lib that we link against. To avoid these
problems it seems the easiest solution is to default to using the
statically compiled musl binaries. If a user knows that they are doing
they can use the non-statically compiled binaries by supplying the `-p`
argument to the installer. Note this is what other rust based tools such
as ripgrep do.

install/install.sh

@@ -170,20 +170,14 @@ detect_platform() {
   local platform
   platform="$(uname -s | tr '[:upper:]' '[:lower:]')"
 
-  # check for MUSL
-  if [ "${platform}" = "linux" ]; then
-    if ldd /bin/sh | grep -i musl >/dev/null; then
-      platform=unknown-linux-musl
-    fi
-  fi
-
   # mingw is Git-Bash
   if echo "${platform}" | grep -i mingw >/dev/null; then
     platform=pc-windows-msvc
   fi
 
   if [ "${platform}" = "linux" ]; then
-    platform=unknown-linux-gnu
+    # use the statically compiled musl bins on linux to avoid linking issues.
+    platform=unknown-linux-musl
   fi
 
   if [ "${platform}" = "darwin" ]; then