Refactor the reconciler and add Woodpecker CI

Now controller looks a bit better and its parts can be tested with
integration tests, that are going to be implemented later.

tests/manifests/configmap.yaml

@@ -0,0 +1,6 @@
+apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: database-configmap
+data:
+  PROTOCOL: postgresql

tests/manifests/example.yaml

@@ -0,0 +1,44 @@
+---
+apiVersion: shoebill.badhouseplants.net/v1alpha1
+kind: ConfigSet
+metadata:
+  name: test
+spec:
+  targets:
+    - name: app-connection-string
+      target:
+        kind: Secret
+        name: app-connection-string
+  inputs:
+    - name: PROTO
+      from:
+        kind: ConfigMap
+        name: database-configmap
+        key: PROTOCOL
+    - name: PASSWORD
+      from:
+        kind: Secret
+        name: database-secret
+        key: PASSWORD
+    - name: USERNAME
+      from:
+        kind: Secret
+        name: database-secret
+        key: USERNAME
+    - name: DATABASE
+      from:
+        kind: Secret
+        name: database-secret
+        key: DATABASE
+  templates:
+    - name: CONNECTION
+      template: "{{ PROTO }}:{{ USERNAME }}:{{ PASSWORD }}/{{ DATABASE }}"
+      target: app-connection-string
+    - name: IS_POSTGRES
+      template: |
+        {{#if (eq PROTO "postgresql") }}
+        true
+        {{ else }}
+        false
+        {{/if}}
+      target: app-connection-string

tests/manifests/secret.yaml

@@ -0,0 +1,8 @@
+apiVersion: v1
+kind: Secret
+metadata:
+  name: database-secret
+stringData:
+  PASSWORD: 123123!!
+  USERNAME: real_root
+  DATABASE: postgres