Add provider configuration

This is imported from opendev/zuul-jobs.

Depends-On: https://review.opendev.org/940543
Change-Id: I8b9dd5af3a3bb6c383e6d3c36056302b8184aae8

zuul.d/flavors.yaml

@@ -0,0 +1,2 @@
+- flavor:
+    name: normal

zuul.d/images.yaml

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+- image:
+    name: debian-bullseye
+    type: zuul

zuul.d/labels.yaml

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+# During testing, prefix all label names with "niz-" so it's very
+# clear which system we're using.
+
+- label:
+    name: niz-debian-bullseye-normal
+    image: debian-bullseye
+    flavor: normal

zuul.d/providers.yaml

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+# Rackspace Flex
+- section:
+    name: raxflex-base
+    abstract: true
+    connection: raxflex
+    boot-timeout: 120
+    launch-timeout: 600
+    networks:
+      - opendevzuul-network1
+    flavors:
+      - name: normal
+        flavor-name: gp.0.4.8
+    images:
+      - name: debian-bullseye
+
+- section:
+    name: raxflex-sjc3
+    parent: raxflex-base
+    region: SJC3
+
+- provider:
+    name: raxflex-sjc3-main
+    section: raxflex-sjc3
+    labels:
+      - name: niz-debian-bullseye-normal
+        key-name: infra-root-keys-2024-04-08
+
+# Vexxhost
+- section:
+    name: vexxhost-base
+    abstract: true
+    connection: vexxhost
+    boot-timeout: 120
+    launch-timeout: 600
+    images:
+      - name: debian-bullseye
+
+- section:
+    name: vexxhost-ca-ymq-1
+    parent: vexxhost-base
+    region: ca-ymq-1
+
+- provider:
+    name: vexxhost-ca-ymq-1-main
+    section: vexxhost-ca-ymq-1