Add a sample Dockerfile.

.lighthouse/triggers.yaml

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+apiVersion: config.lighthouse.jenkins-x.io/v1alpha1
+kind: TriggerConfig
+spec:
+  postsubmits:
+    - name: semver
+      agent: tekton-pipeline
+      branches:
+        - ^main$
+        - ^master$
+      context: homepage
+      max_concurrency: 1
+      # Override https-based url from lighthouse events.
+      clone_uri: "git@code.fizz.buzz:talexander/homepage.git"
+      pipeline_run_spec:
+        serviceAccountName: build-bot
+        pipelineRef:
+          name: semver
+          namespace: lighthouse
+        workspaces:
+          - name: git-source
+            volumeClaimTemplate:
+              spec:
+                storageClassName: "nfs-client"
+                accessModes:
+                  - ReadWriteOnce
+                resources:
+                  requests:
+                    storage: 10Gi
+            subPath: homepage-source
+        params: []
+    - name: build-homepage
+      agent: tekton-pipeline
+      branches:
+        - "^v[0-9]+\\.[0-9]+\\.[0-9]+$"
+      context: build-docker
+      max_concurrency: 1
+      # Override https-based url from lighthouse events.
+      clone_uri: "git@code.fizz.buzz:talexander/homepage.git"
+      pipeline_run_spec:
+        serviceAccountName: build-bot
+        pipelineRef:
+          name: build-docker-pipeline
+        workspaces:
+          - name: git-source
+            volumeClaimTemplate:
+              spec:
+                storageClassName: "nfs-client"
+                accessModes:
+                  - ReadWriteOnce
+                resources:
+                  requests:
+                    storage: 10Gi
+            subPath: git-source
+          - name: docker-credentials
+            secret:
+              secretName: harbor-plain
+        params:
+          - name: image-name
+            value: "harbor.fizz.buzz/private/homepage"
+          - name: path-to-image-context
+            value: .
+          - name: path-to-dockerfile
+            value: docker/server/Dockerfile

docker/server/Dockerfile

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+FROM harbor.fizz.buzz/dockerhub/library/python:3.9
+
+RUN useradd -m -g nogroup server
+USER server
+
+CMD ["python", "-c", "print('worked')"]