feat(policy): add file_not_deleted predicate to workflow rules

Author: dblinkhorn

.policy.dev.yml

@@ -0,0 +1,45 @@
+# This file is generated by policy-gen.
+# Do not edit directly. Run "make .policy.yml" to update.
+
+policy:
+  approval:
+    - or:
+        - and:
+            - Workflow .github/workflows/build.yml succeeded or skipped
+            - Workflow .github/workflows/lint.yml succeeded or skipped
+            - default to approval
+approval_rules:
+  - name: Workflow .github/workflows/build.yml succeeded or skipped
+    if:
+      changed_files:
+        paths:
+          - ^go\.mod$
+          - ^go\.sum$
+          - ^(?:(?:[^/]*(?:/|$))*)(?:[^/]*)\.go$
+          - ^Dockerfile$
+          - ^\.github\/workflows\/build\.yml$
+      file_not_deleted:
+        paths:
+          - ^\.github\/workflows\/build\.yml$
+    requires:
+      conditions:
+        has_workflow_result:
+          conclusions:
+            - skipped
+            - success
+          workflows:
+            - .github/workflows/build.yml
+  - name: Workflow .github/workflows/lint.yml succeeded or skipped
+    if:
+      file_not_deleted:
+        paths:
+          - ^\.github\/workflows\/lint\.yml$
+    requires:
+      conditions:
+        has_workflow_result:
+          conclusions:
+            - skipped
+            - success
+          workflows:
+            - .github/workflows/lint.yml
+  - name: default to approval