Fix issue "./codesign.sh: line 39: pcregrep: command not found".

For some reason, pcregrep was available on macOS Github images previously, but no longer.
Ensure that pcregrep is installed.

Author: mrclary

.github/workflows/installer-macos.yml

@@ -66,6 +66,13 @@ jobs:
         with:
           python-version: '3.9.14'
           architecture: 'x64'
+      - name: Install pcregrep
+        run: |
+          if [[ -z "$(which pcregrep)" ]]; then
+              brew install pcre
+          else
+              echo "$(which pcregrep) already installed."
+          fi
       - name: Install Dependencies
         run: |
           INSTALL_FLAGS=()

.github/workflows/installers-conda.yml

@@ -121,6 +121,15 @@ jobs:
         with:
           fetch-depth: 0
 
+      - name: Install pcregrep
+        if: runner.os == 'macOS'
+        run: |
+          if [[ -z "$(which pcregrep)" ]]; then
+              brew install pcre
+          else
+              echo "$(which pcregrep) already installed."
+          fi
+
       - name: Setup Build Environment
         uses: mamba-org/provision-with-micromamba@main
         with: