Run dev-mode Vault inside the integration step

.woodpecker/integration.yaml

@@ -3,36 +3,26 @@ when:
 
 # Kept out of test.yaml so the three required PR contexts (build/test/pre-commit)
 # stay exactly what they were; this one needs a Vault next to it.
-services:
-  - name: vault
-    image: hashicorp/vault:1.20
-    # The kubernetes backend builds the Service from this list; without it the
-    # service resolves but carries no port.
-    ports:
-      - 8200
-    environment:
-      # Throwaway dev-mode server; this token grants nothing outside this pod.
-      VAULT_DEV_ROOT_TOKEN_ID: dev-root-token
-      VAULT_DEV_LISTEN_ADDRESS: 0.0.0.0:8200
-    backend_options:
-      kubernetes:
-        serviceAccountName: default
-        resources:
-          requests:
-            memory: 512Mi
-            cpu: 1
-          limits:
-            memory: 2Gi
-            cpu: 2
-
 steps:
   - name: integration
     image: golang:1.25
     environment:
-      SSHSIGNHOST_TEST_VAULT_ADDR: http://vault:8200
+      VAULT_VERSION: 1.20.4
+      VAULT_SHA256: fc5fb5d01d192f1216b139fb5c6af17e3af742aaeffc289fd861920ec55f2c9c
+      SSHSIGNHOST_TEST_VAULT_ADDR: http://127.0.0.1:8200
+      # Throwaway dev-mode server on loopback; this token grants nothing.
       VAULT_TOKEN: dev-root-token
     commands:
-      - go test -tags=integration -count=1 -v -run TestIntegration ./...
+      # The golang image does not trust the estate's internal CA, so artifactapi
+      # is fetched over http and the archive is pinned by checksum instead.
+      - curl -fsSL -o /tmp/vault.zip "http://artifactapi.k8s.syd1.au.unkin.net/api/v1/remote/hashicorp-releases/vault/$${VAULT_VERSION}/vault_$${VAULT_VERSION}_linux_amd64.zip"
+      - echo "$${VAULT_SHA256}  /tmp/vault.zip" | sha256sum -c -
+      - python3 -m zipfile -e /tmp/vault.zip /usr/local/bin/
+      - chmod +x /usr/local/bin/vault
+      # Dev mode serves plain HTTP; the suite polls /v1/sys/health rather than
+      # sleeping, and the timeout keeps a wedged server from pinning an agent.
+      - vault server -dev -dev-root-token-id="$${VAULT_TOKEN}" -dev-listen-address=127.0.0.1:8200 >/tmp/vault.log 2>&1 &
+      - timeout 600 go test -tags=integration -count=1 -v -run TestIntegration ./...
     backend_options:
       kubernetes:
         serviceAccountName: default