Kubernetes multiple deployments using single template for CI/CD

Question

I'm bit new to kubernetes, I know we can create multiple deployments using same template. I have already gone through this. But my requirement is slight different. I have 30 deployment files wherein only two parameters that's deployment name and python script1.py keeps on updating for all deployments. Below are sample deployment files

deployment1.yaml

apiVersion: apps/v1
kind: Deployment
metadata:
  labels:
    app: deploy1    <-- Will be updated every time for all deployments
  name: deploy1     <-- Will be updated every time for all deployments
spec:
  replicas: 3
  selector:
    matchLabels:
      app: deploy1
  strategy:
    rollingUpdate:
      maxSurge: 2
      maxUnavailable: 0
    type: RollingUpdate
  template:
    metadata:
      labels:
        app: deploy1
    spec:
      containers:
      - name: web
        image: nginx
        command: ["/bin/sh"]
        args:
          - -c
          - >-
              python script1.py     <-- Will be updated every time for all deployments

deployment2.yaml

apiVersion: apps/v1
kind: Deployment
metadata:
  labels:
    app: deploy2    <-- Will be updated every time for all deployments
  name: deploy2     <-- Will be updated every time for all deployments
spec:
  replicas: 3
  selector:
    matchLabels:
      app: deploy2
  strategy:
    rollingUpdate:
      maxSurge: 2
      maxUnavailable: 0
    type: RollingUpdate
  template:
    metadata:
      labels:
        app: deploy2
    spec:
      containers:
      - name: web
        image: nginx
        command: ["/bin/sh"]
        args:
          - -c
          - >-
              python script2.py     <-- Will be updated every time for all deployments

I want to know how can I convert this into single template so that multiple deployments can be deployed into the cluster. Eventually I want to integrate this into cloud build as a part of my CI/CD.

Any help would be appreciated here.

Update 1 :

@Moritz Schmitz v. Hülst I have updated my code to include below files in my helm chart.

here is my values.yaml

deployments:
  - image: nginx
  - name: deploy1
    script: script1.py
  - name: deploy2
    script: script2.py

template/deployment.yaml

{{- range .Values.deployments }}

---
apiVersion: apps/v1
kind: Deployment
metadata:
  labels:
    app: {{ .name }}
  name: {{ .name }}
spec:
  replicas: 3
  selector:
    matchLabels:
      app: {{ .name }}
  strategy:
    rollingUpdate:
      maxSurge: 2
      maxUnavailable: 0
    type: RollingUpdate
  template:
    metadata:
      labels:
        app: {{ .name }}
    spec:
      containers:
      - name: web
        image: {{ .image }}
        ports:
        - containerPort: 80
{{- end }}

template/service.yaml

{{- range .Values.deployments }}
apiVersion: v1
kind: Service
metadata:
  name: {{ .name }}
spec:
  type: ClusterIP
  ports:
  - port: 80
    targetPort: 80
  selector:
    app: {{ .name }}
{{- end }}

I get below error while running helm install demo-nginx demo-hello/,

Error: INSTALLATION FAILED: unable to build kubernetes objects from release manifest: error validating "": error validating data: [unknown object type "nil" in Deployment.metadata.labels.app, unknown object type "nil" in Deployment.spec.selector.matchLabels.app, unknown object type "nil" in Deployment.spec.template.metadata.labels.app]

Answer 1

deployment.yaml:

{{- range .Values.deployments }}
---
apiVersion: apps/v1
kind: Deployment
metadata:
  labels:
    app: {{ .name }}
  name: {{ .name }}
spec:
  replicas: 3
  selector:
    matchLabels:
      app: {{ .name }}
  strategy:
    rollingUpdate:
      maxSurge: 2
      maxUnavailable: 0
    type: RollingUpdate
  template:
    metadata:
      labels:
        app: {{ .name }}
    spec:
      containers:
      - name: web
        image: nginx
        command: ["/bin/sh"]
        args:
          - -c
          - >-
              python {{ .script }}
{{- end }}

values.yaml:

deployments:
  - name: deploy1
    script: script1.py
  - name: deploy2
    script: script2.py