feat: add branch protection

- add branch protection rules for docker repos

config/git.unkin.net/unkin/repository/container-agent-base.yaml

@@ -1,2 +1,13 @@
 description: "Base container image for forgebot agents"
 private: false
+default_branch: "main"
+default_delete_branch_after_merge: true
+default_merge_style: "squash"
+branch_protection:
+  - rule_name: "main"
+    enable_push: false
+    status_check_contexts:
+      - "ci/woodpecker/pr/build"
+    approval_whitelist_teams:
+      - "docker"
+      - "forgebot"

config/git.unkin.net/unkin/repository/container-agent-dev.yaml

@@ -1,2 +1,13 @@
 description: "Dev toolchain container for forgebot agents"
 private: false
+default_branch: "main"
+default_delete_branch_after_merge: true
+default_merge_style: "squash"
+branch_protection:
+  - rule_name: "main"
+    enable_push: false
+    status_check_contexts:
+      - "ci/woodpecker/pr/build"
+    approval_whitelist_teams:
+      - "docker"
+      - "forgebot"

config/git.unkin.net/unkin/repository/container-agent-infra.yaml

@@ -1,2 +1,13 @@
 description: "Infrastructure toolchain container for forgebot agents"
 private: false
+default_branch: "main"
+default_delete_branch_after_merge: true
+default_merge_style: "squash"
+branch_protection:
+  - rule_name: "main"
+    enable_push: false
+    status_check_contexts:
+      - "ci/woodpecker/pr/build"
+    approval_whitelist_teams:
+      - "docker"
+      - "forgebot"