Add GCC8 to packages list (#5)

This commit adds bin packages list, that would be installed without --build-from-source option.
And uses this list to add GCC8 to linuxbrew packages.

brew-build.sh

@@ -111,6 +111,10 @@ BREW_PACKAGES=(
   s3cmd
 )
 
+BREW_BIN_PACKAGES=(
+  gcc@8
+)
+
 successful_packages=()
 failed_packages=()
 
@@ -123,6 +127,15 @@ for package in "${BREW_PACKAGES[@]}"; do
   fi
 done
 
+for package in "${BREW_BIN_PACKAGES[@]}"; do
+  if ( set -x; ./bin/brew install "$package" ); then
+    successful_packages+=( "$package" )
+  else
+    echo >&2 "Failed to install package: $package"
+    failed_packages+=( "$package" )
+  fi
+done
+
 echo "Successfully installed packages: ${successful_packages[*]}"
 
 if [[ ${#failed_packages[@]} -gt 0 ]]; then