Add almalinux9-base and gobuilder repos

Split the first two container images out of the packer-images monorepo into
one repo per image.

config/git.unkin.net/unkin/repository/almalinux9-base.yaml

@@ -0,0 +1,16 @@
+description: "AlmaLinux 9 base container image for the estate, carrying internal CA trust and dnf repository configuration."
+private: false
+default_branch: "main"
+default_delete_branch_after_merge: true
+default_merge_style: "squash"
+branch_protection:
+  - rule_name: "main"
+    merge_whitelist_teams:
+      - "Owners"
+    enable_push: false
+    status_check_contexts:
+      - "ci/woodpecker/pr/build"
+      - "ci/woodpecker/pr/test"
+      - "ci/woodpecker/pr/pre-commit"
+    approval_whitelist_users:
+      - "benvin"

config/git.unkin.net/unkin/repository/gobuilder.yaml

@@ -0,0 +1,16 @@
+description: "Go toolchain builder container image, built from almalinux9-base, used by Woodpecker pipelines to compile Go projects."
+private: false
+default_branch: "main"
+default_delete_branch_after_merge: true
+default_merge_style: "squash"
+branch_protection:
+  - rule_name: "main"
+    merge_whitelist_teams:
+      - "Owners"
+    enable_push: false
+    status_check_contexts:
+      - "ci/woodpecker/pr/build"
+      - "ci/woodpecker/pr/test"
+      - "ci/woodpecker/pr/pre-commit"
+    approval_whitelist_users:
+      - "benvin"