Add zizmor & fix findings

Author: AlexVerrico

.github/workflows/check-pr-template.yml

@@ -4,6 +4,9 @@ on:
   pull_request:
     types: [opened, edited, reopened, synchronize]
 
+permissions:
+  contents: read
+
 jobs:
   check-pr-template:
     name: Check PR template

.github/workflows/ci.yml

@@ -11,6 +11,9 @@ concurrency:
   group: ${{ github.ref }}
   cancel-in-progress: true
 
+permissions:
+  contents: read
+
 defaults:
   run:
     shell: bash

.github/workflows/new-issue.yml

@@ -11,8 +11,11 @@ jobs:
   add-to-project:
     name: Add issue to BeeWare project
     runs-on: ubuntu-latest
+    # The add-to-project action authenticates with BRUTUS_PAT_TOKEN, so the
+    # job's own GITHUB_TOKEN needs no permissions.
+    permissions: {}
     steps:
-      - uses: actions/add-to-project@v2.0.0
+      - uses: actions/add-to-project@5afcf98fcd03f1c2f92c3c83f58ae24323cc57fd # v2.0.0
         with:
           project-url: https://github.com/orgs/beeware/projects/1
           github-token: ${{ secrets.BRUTUS_PAT_TOKEN }}

.github/zizmor.yml

@@ -0,0 +1,9 @@
+rules:
+  unpinned-uses:
+    config:
+      # Allow BeeWare-provided actions to be unpinned. If an attacker is in a
+      # position to exploit those action, they're probably able to exploit
+      # repositories directly; and it's significantly easier for our internal
+      # actions to automatically be the most recent versions.
+      policies:
+        beeware/*: ref-pin

.pre-commit-config.yaml

@@ -8,3 +8,7 @@ repos:
       - id: check-case-conflict
       - id: end-of-file-fixer
       - id: trailing-whitespace
+  - repo: https://github.com/zizmorcore/zizmor-pre-commit
+    rev: v1.26.1
+    hooks:
+      - id: zizmor