Remove docker build cache

.woodpecker/pr-build.yaml

@@ -8,10 +8,6 @@
 #
 # Reports pass/fail status back to Gitea, so it shows up as a required check on
 # the PR.
-#
-# Registry credentials are fetched from OpenBao (same AppRole as release.yaml)
-# solely to read and write the build cache image. The build itself is still
-# dry-run (nothing is published as a release image).
 
 # Changes that can't affect the image don't trigger the build: docs and the
 # RouterOS-side script (routeros/**: lives on the router, not in the image).
@@ -33,40 +29,11 @@ when:
       exclude: *non_image_paths
 
 steps:
-  - name: Get registry creds from OpenBao
-    image: quay.io/openbao/openbao:2.5.4
-    environment:
-      VAULT_ADDR: https://openbao.lumpiasty.xyz:8200
-      ROLE_ID:
-        from_secret: renovate_role_id
-      SECRET_ID:
-        from_secret: renovate_secret_id
-    commands:
-      - bao write -field token auth/approle/login
-          role_id=$ROLE_ID
-          secret_id=$SECRET_ID > /woodpecker/.vault_id
-      - export VAULT_TOKEN=$(cat /woodpecker/.vault_id)
-      - 'printf "PLUGIN_USERNAME=%s\n" "$(bao kv get -mount secret -field REGISTRY_USERNAME container-registry)" > /woodpecker/registry.env'
-      - 'printf "PLUGIN_PASSWORD=%s\n" "$(bao kv get -mount secret -field REGISTRY_PASSWORD container-registry)" >> /woodpecker/registry.env'
-
   - name: Build all arches (no push)
     image: woodpeckerci/plugin-docker-buildx:6.1.0
     privileged: true
     settings:
-      registry: gitea.lumpiasty.xyz
-      repo: mikrotik-tailscale
       platforms: linux/amd64,linux/arm64,linux/arm/v7
       dry_run: true
       build_args:
         - OCI_VERSION=ci-${CI_COMMIT_SHA}
-      cache_images:
-        - gitea.lumpiasty.xyz/lumpiasty/mikrotik-tailscale:buildcache
-      env_file: /woodpecker/registry.env
-
-  - name: Invalidate OpenBao token
-    image: quay.io/openbao/openbao:2.5.4
-    environment:
-      VAULT_ADDR: https://openbao.lumpiasty.xyz:8200
-    commands:
-      - export VAULT_TOKEN=$(cat /woodpecker/.vault_id)
-      - bao write -f auth/token/revoke-self

.woodpecker/release.yaml

@@ -54,8 +54,6 @@ steps:
         - stable
       build_args:
         - OCI_VERSION=${CI_COMMIT_TAG}
-      cache_images:
-        - gitea.lumpiasty.xyz/lumpiasty/mikrotik-tailscale:buildcache
       # Credentials (PLUGIN_USERNAME / PLUGIN_PASSWORD) come from OpenBao.
       env_file: /woodpecker/registry.env
   - name: Invalidate OpenBao token