docs: add postgres example promise

Author: ChunyiLyu

examples/postgres/README.md

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+# How to use this example
+
+This Promise was generated with using kratix CLI:
+
+```bash
+kratix init promise database  --group demo.kratix.io --kind Database
+```
+
+To see this example promise working, you need to build and load two images to your environment:
+1. promise configure workflow container image
+2. resource configure workflow container image
+
+You can build and load the promise configure workflow image by running:
+```bash
+docker build -t kratix-demo/promise-pipeline:v0.1.0 workflows/promise/configure/dependencies/configure-deps
+kind load docker-image kratix-demo/promise-pipeline:v0.1.0 -n <your-local-kind-cluster>
+```
+
+For the resource configure workflow, run:
+```bash
+docker build -t kratix-demo/resource-pipeline:v0.1.0 workflows/resource/configure/database-configure/kratix-demo-resource-pipeline
+kind load docker-image kratix-demo/resource-pipeline:v0.1.0 -n <your-local-kind-cluster>
+```
+
+After making these two images available in your k8s cluster, you can install the promise:
+```bash
+kubectl apply -f promise.yaml
+```
+
+you can request a database by:
+```bash
+kubectl apply -f example-resource.yaml
+```

examples/postgres/example-resource.yaml

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+apiVersion: demo.kratix.io/v1beta1
+kind: Database
+metadata:
+  name: example-database
+spec:
+  size: "1Gi"

examples/postgres/promise.yaml

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+apiVersion: platform.kratix.io/v1alpha1
+kind: Promise
+metadata:
+  creationTimestamp: null
+  labels:
+    kratix.io/promise-version: v0.0.1
+  name: database
+spec:
+  api:
+    apiVersion: apiextensions.k8s.io/v1
+    kind: CustomResourceDefinition
+    metadata:
+      creationTimestamp: null
+      name: databases.demo.kratix.io
+    spec:
+      group: demo.kratix.io
+      names:
+        kind: Database
+        plural: databases
+        singular: database
+      scope: Namespaced
+      versions:
+      - name: v1beta1
+        schema:
+          openAPIV3Schema:
+            properties:
+              spec:
+                properties:
+                  size:
+                    type: string
+                type: object
+            type: object
+        served: true
+        storage: true
+    status:
+      acceptedNames:
+        kind: ""
+        plural: ""
+      conditions: null
+      storedVersions: null
+  workflows:
+    promise:
+      configure:
+      - apiVersion: platform.kratix.io/v1alpha1
+        kind: Pipeline
+        metadata:
+          name: dependencies
+        spec:
+          containers:
+          - image: kratix-demo/promise-pipeline:v0.1.0
+            name: configure-deps
+    resource:
+      configure:
+      - apiVersion: platform.kratix.io/v1alpha1
+        kind: Pipeline
+        metadata:
+          name: database-configure
+        spec:
+          containers:
+          - image: kratix-demo/resource-pipeline:v0.1.0
+            name: kratix-demo-resource-pipeline
+status: {}

examples/postgres/workflows/promise/configure/dependencies/configure-deps/Dockerfile

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+FROM "alpine"
+
+RUN apk update && apk add --no-cache yq
+
+ADD scripts/pipeline.sh /usr/bin/pipeline.sh
+ADD resources resources
+
+RUN chmod +x /usr/bin/pipeline.sh
+
+CMD [ "sh", "-c", "pipeline.sh" ]
+ENTRYPOINT []