CI: Silence all of Homebrew's intrusive/irritating nonsense warnings

Homebrew is waaaaaay too spammy with their warning policy and we're
fed up with seeing their harmless warnings polluting our workflow
summary. Downgrade all Homebrew warnings to only appear in the log.

Author: bonachea

.github/workflows/build.yml

@@ -174,7 +174,7 @@ jobs:
       FFLAGS: ${{ matrix.extra_flags }}
       FPM_FLAGS:  --profile release --verbose
       CURL_OPTIONS: --retry 10 --retry-all-errors --fail -L
-      BREW_WARNING_FILTER: 's/^[[:punct:]]*warning[[:punct:]]*(You are using macOS)/warn: \1/i'
+      BREW_WARNING_FILTER: 's/^[[:punct:]]+warning[[:punct:]]+/warning: /i'
 
     steps:
     - name: Checkout code
@@ -214,7 +214,8 @@ jobs:
           chmod +x install-homebrew.sh
           env CI=1 ./install-homebrew.sh
           HOMEBREW_PREFIX="/home/linuxbrew/.linuxbrew"
-          retry ${HOMEBREW_PREFIX}/bin/brew install -v gcc@${COMPILER_VERSION} binutils
+          retry ${HOMEBREW_PREFIX}/bin/brew install -v gcc@${COMPILER_VERSION} binutils \
+            2>&1 | perl -pe "$BREW_WARNING_FILTER" ; test ${PIPESTATUS[0]} = 0
           ls -al ${HOMEBREW_PREFIX}/bin
           echo "PATH=${HOMEBREW_PREFIX}/bin:${PATH}" >> "$GITHUB_ENV"
           : Homebrew GCC@15 needs binutils 2.44+
@@ -241,7 +242,8 @@ jobs:
       if: ${{ contains(matrix.os, 'macos') }}
       run: |
         # silence Homebrew tap trust warnings:
-        (set +e ; brew untap -f aws/tap hashicorp/tap 2>&1 | perl -pe 's/^::*//;s/^##*//' ; brew trust azure/bicep ; echo )
+        (set +e ; brew untap -f aws/tap hashicorp/tap ; brew trust azure/bicep ) \
+            2>&1 | perl -pe "$BREW_WARNING_FILTER" 
         # set some Homebrew knobs to accelerate installation
         # but only when we are not simulating the user environment brew-via-install workflow
         if [[ -z "${{ matrix.brew_via_install }}" ]] ; then
@@ -254,7 +256,8 @@ jobs:
     - name: Install macOS Dependencies
       if: contains(matrix.os, 'macos')
       run: |
-        retry brew update
+        retry brew update \
+            2>&1 | perl -pe "$BREW_WARNING_FILTER" ; test ${PIPESTATUS[0]} = 0
         # fpm binary distribution for macOS requires gfortran shared libraries from gcc@12
         retry brew install gcc@12 \
             2>&1 | perl -pe "$BREW_WARNING_FILTER" ; test ${PIPESTATUS[0]} = 0