Set kubernetes backend options on all woodpecker steps

Give every CI step explicit resource requests/limits and the default service
account (matching the pre-commit step), so the k8s woodpecker backend schedules
them with bounded resources.

- build/test/lint/package steps: 512Mi/1cpu requests, 2Gi/2cpu limits
- upload step: lighter 128Mi/100m requests, 512Mi/500m limits

.woodpecker/build.yml

@@ -6,3 +6,13 @@ steps:
     image: golang:1.25
     commands:
       - make build
+    backend_options:
+      kubernetes:
+        serviceAccountName: default
+        resources:
+          requests:
+            memory: 512Mi
+            cpu: 1
+          limits:
+            memory: 2Gi
+            cpu: 2

.woodpecker/release.yml

@@ -6,6 +6,16 @@ steps:
     image: git.unkin.net/unkin/almalinux9-gobuilder:20260606
     commands:
       - make package VERSION=${CI_COMMIT_TAG}
+    backend_options:
+      kubernetes:
+        serviceAccountName: default
+        resources:
+          requests:
+            memory: 512Mi
+            cpu: 1
+          limits:
+            memory: 2Gi
+            cpu: 2
 
   - name: upload
     image: git.unkin.net/unkin/almalinux9-base:20260606
@@ -17,3 +27,14 @@ steps:
           "https://artifactapi.k8s.syd1.au.unkin.net/api/v2/remotes/terraform-unkin/files/unkin/litellmvaultsecret/$${FILE}" \
           -H "Content-Type: application/zip" \
           --data-binary @"$${FILE}"
+    depends_on: [package]
+    backend_options:
+      kubernetes:
+        serviceAccountName: default
+        resources:
+          requests:
+            memory: 128Mi
+            cpu: 100m
+          limits:
+            memory: 512Mi
+            cpu: 500m

.woodpecker/test.yml

@@ -6,8 +6,28 @@ steps:
     image: golang:1.25
     commands:
       - make lint
+    backend_options:
+      kubernetes:
+        serviceAccountName: default
+        resources:
+          requests:
+            memory: 512Mi
+            cpu: 1
+          limits:
+            memory: 2Gi
+            cpu: 2
 
   - name: test
     image: golang:1.25
     commands:
       - make test
+    backend_options:
+      kubernetes:
+        serviceAccountName: default
+        resources:
+          requests:
+            memory: 512Mi
+            cpu: 1
+          limits:
+            memory: 2Gi
+            cpu: 2