[DEVOPS-825] make Mira and upstream Simpeg workflow for Zizmor exclusive

Author: sebhmg

.github/workflows/zizmor-security-mira.yml

@@ -20,6 +20,8 @@ on:
 jobs:
   call-workflow-zizmor:
     name: Zizmor analysis
+    # run on the Mira repo only (upstram SimPEG repo has its own workflow for Zizmor)
+    if: startsWith(github.repository, 'MiraGeoscience/')
     permissions:
       contents: read
       actions: read

.github/workflows/zizmor-security-upstream.yml

@@ -13,6 +13,8 @@ permissions: {}
 
 jobs:
   lint:
+    # run only if not on the Mira repo (MiraGeoscience repo has its own workflow for Zizmor)
+    if: ${{ !startsWith(github.repository, 'MiraGeoscience/') }}
     runs-on: ubuntu-latest
     steps:
       - name: Checkout