feat(dummyhttp): first version of the application

dummyhttp/README.md

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+# Dummyhttp kustomize application
+
+This application deploys a container that runs an instance of the [dummyhttp](https://github.com/svenstaro/dummyhttp)
+application that returns a string that uses environment variables added to the container from a `ConfigMap` and a
+`Secret`.
+
+The container image is built from a generic
+[Dockerfile](https://forgejo.mixinet.net/oci/images/src/tag/dummyhttp-v1.0.0/dummyhttp/Dockerfile) that runs the
+application directly, but we have modified the arguments on the `Deployment` to be able to use environment variables on
+the arguments to the server (we use `/bin/sh -c` as entrypoint and the command uses `eval` to expand the environment
+variables when calling the application).
+
+The base application includes a `Deployment`, a `Service` and an `Ingress` definition; the `Deployment` uses environment
+variables from a `ConfigMap` and a `Secret` if they are available, but we've marked them as optional to be able to
+deploy the application without having them available.

dummyhttp/deployment.yaml

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+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: dummyhttp
+  labels:
+    app: dummyhttp
+spec:
+  selector:
+    matchLabels:
+      app: dummyhttp
+  template:
+    metadata:
+      labels:
+        app: dummyhttp
+    spec:
+      containers:
+      - name: dummyhttp
+        image: forgejo.mixinet.net/oci/dummyhttp:1.0.0
+        command: [ "/bin/sh", "-c" ]
+        args:
+        - 'eval dummyhttp -b \"{\\\"c\\\": \\\"$CM_VAR\\\", \\\"s\\\": \\\"$SECRET_VAR\\\"}\"'
+        ports:
+        - containerPort: 8080
+        env:
+        - name: CM_VAR
+          valueFrom:
+            configMapKeyRef:
+              name: dummyhttp-configmap
+              key: CM_VAR
+              optional: true
+        - name: SECRET_VAR
+          valueFrom:
+            secretKeyRef:
+              name: dummyhttp-secret
+              key: SECRET_VAR
+              optional: true

dummyhttp/ingress.yaml

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+apiVersion: networking.k8s.io/v1
+kind: Ingress
+metadata:
+  name: dummyhttp
+  annotations:
+    traefik.ingress.kubernetes.io/router.tls: "true"
+spec:
+  rules:
+    - host: dummyhttp.localhost.mixinet.net
+      http:
+        paths:
+          - path: /
+            pathType: Prefix
+            backend:
+              service:
+                name: dummyhttp
+                port:
+                  number: 80

dummyhttp/kustomization.yaml

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+apiVersion: kustomize.config.k8s.io/v1beta1
+kind: Kustomization
+
+resources:
+- deployment.yaml
+- service.yaml
+- ingress.yaml

dummyhttp/msr.yaml

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+version: 1.0.0

dummyhttp/service.yaml

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+apiVersion: v1
+kind: Service
+metadata:
+  name: dummyhttp
+spec:
+  selector:
+    app: dummyhttp
+  ports:
+  - name: http
+    port: 80
+    targetPort: 8080