drawings/uralkal: workflow env for DWG export

drawings-api builds its workflows client from WORKFLOW_HOST, which no cluster
set, so POST /internal/v1/exports failed with 'unsupported protocol scheme'.
Add WORKFLOW_HOST and the other export settings from the drawings-api chart
with uralkal service addresses (processing, drawings, attachments).

apps/drawings/uralkal/backend.yaml

@@ -0,0 +1,46 @@
+---
+apiVersion: helm.toolkit.fluxcd.io/v2
+kind: HelmRelease
+metadata:
+  name: backend
+  namespace: drawings
+spec:
+  values:
+    services:
+      backend:
+        envs:
+          - name: POSTGRES_POOL_SIZE
+            value:
+              _default: "3"
+
+          - name: API_ADDRESS
+            value:
+              _default: "0.0.0.0:8000"
+
+          - name: ENABLE_SSL
+            value:
+              _default: "0"
+
+          - name: WORKFLOW_HOST
+            value:
+              _default: "http://backend-svc.processing.svc.cluster.local/"
+
+          - name: IMAGE_NAME_EXPORT_TO_DWG
+            value:
+              _default: "cross-sections-to-dwg"
+
+          - name: IMAGE_TAG
+            value:
+              _default: "develop"
+
+          - name: TASK_VERSION
+            value:
+              _default: "1"
+
+          - name: DRAWING_INTERNAL_URL
+            value:
+              _default: "http://backend-service.drawings.svc.cluster.local:8000/"
+
+          - name: ATTACHMENT_URL
+            value:
+              _default: "http://attachments-service.attachments.svc.cluster.local:8000"

apps/drawings/uralkal/kustomization.yaml

@@ -2,3 +2,8 @@ apiVersion: kustomize.config.k8s.io/v1beta1
 kind: Kustomization
 resources:
   - ../base
+patches:
+  - path: backend.yaml
+    target:
+      kind: HelmRelease
+      name: backend