[setup-r]: try to unlink brew R silently (#891)

* [setup-r]: try to unlink brew R silently

To avoid #864.

* [setup-r]: run brew install silently

brew likes to warn about already installed packages
and env vars, but we don't care about these.

* NEWS for avoiding brew warnings

NEWS.md

@@ -14,6 +14,8 @@
   unchanged, on all R versions. To avoid using a P3M snapshot on R 3.6.x,
   set the `RSPM_PIN_3_6` environment variable to `false`.
 
+* `[setup-r]` now avoids spurious warnings from Homebrew (#864).
+
 * `[setup-r-dependencies]` now accepts `pak-version: none` to skip pak
   installation. pak should be already installed on the system in this
   case, otherwise the dependencies resolution and installation will fail.

setup-r/src/installer.ts

@@ -258,7 +258,7 @@ async function acquireUtilsMacOS() {
       "pkgconfig",
       "checkbashisms",
       "ghostscript",
-    ]);
+    ], { silent: true });
   } catch (error) {
     core.debug(`${error}`);
 
@@ -398,7 +398,7 @@ async function acquireRMacOS(version: IRVersion): Promise<string> {
 
   // Remove homebrew R from the PATH
   try {
-    await exec.exec("brew", ["unlink", "r"]);
+    await exec.exec("brew", ["unlink", "r"] , { silent: true });
   } catch (error) {
     core.debug(`${error}`);
   }