Add compatibility matrix fixture execution

Run package test jobs across every selected provider combination with isolated lane state, released-image canaries, controlled OIDC DNS, and deterministic cleanup.

tests/kind/durable-job.yaml.in

@@ -1,7 +1,7 @@
 apiVersion: batch/v1
 kind: Job
 metadata:
-  name: durable-substrate
+  name: @@JOB_NAME@@
   namespace: remora-testbed
 spec:
   activeDeadlineSeconds: 600
@@ -16,11 +16,19 @@ spec:
         - name: tests
           image: @@TEST_IMAGE@@
           imagePullPolicy: Never
+          envFrom:
+            - configMapRef: {name: @@PROFILE_NAME@@}
           env:
-            - name: DATABASE_URL
-              value: postgres://remora:synthetic-postgres@postgres:5432/remora?sslmode=disable
             - name: REMORA_DURABLE_REQUIRE_DB
               value: "1"
+          volumeMounts:
+            - {name: fixture-profile, mountPath: /run/remora-fixture, readOnly: true}
           resources:
             requests: {cpu: 250m, memory: 256Mi}
             limits: {cpu: "2", memory: 1Gi}
+      volumes:
+        - name: fixture-profile
+          configMap:
+            name: @@PROFILE_NAME@@-file
+            items:
+              - {key: profile.env, path: profile.env}