Install wasmer binary from Github releases (#1765)

The current Github action responsible for installing Wasmer fails from
time to time, and it also is outdated, not following the new NodeJS 16
requirement by Github.

We could use https://github.com/jaxxstorm/action-install-gh-release
instead, but unfortunately, it does not have the proper support to
expose the binaries contained in an inner folder, as in the case with
the Wasmer release. In the meantime, let's use my
[fork](https://github.com/jonaprieto/action-install-gh-release) while I
open PR to the main repository.

.github/workflows/ci.yml

@@ -227,8 +227,13 @@ jobs:
         run: |
           echo "WASI_SYSROOT_PATH=$GITHUB_WORKSPACE/wasi-sysroot" >> $GITHUB_ENV
 
-      - name: Setup Wasmer
-        uses: wasmerio/setup-wasmer@v2
+      - name: Install the latest Wasmer version
+        uses: jonaprieto/action-install-gh-release@1
+        with:
+          repo: wasmerio/wasmer
+          tag: latest
+          binaries-location: bin
+          cache: true
 
       - name: Set homebrew LLVM CC and LIBTOOL vars (macOS)
         if: runner.os == 'macOS'