Update index.md

Add trust call for newer versions of brew https://docs.brew.sh/Tap-Trust

Signed-off-by: Anthony Corletti <anthcor@gmail.com>

Author: anthonycorletti

docs/index.md

@@ -20,6 +20,9 @@ install `datumctl` via our official tap:
 # Tap the Datum Cloud formula repository (only needs to be done once)
 brew tap datum-cloud/homebrew-tap
 
+# Trust the datumctl formula
+brew trust --formula datum-cloud/homebrew-tap/datumctl
+
 # Install datumctl
 brew install datumctl