Use 'v' prefix for default exporter image tag

charts/iperf3-monitor/templates/exporter-deployment.yaml

@@ -20,7 +20,7 @@ spec:
       serviceAccountName: {{ include "iperf3-monitor.serviceAccountName" . }}
       containers:
       - name: iperf3-exporter
-        image: "{{ .Values.exporter.image.repository }}:{{ .Values.exporter.image.tag | default .Chart.AppVersion }}"
+        image: "{{ .Values.exporter.image.repository }}:{{ .Values.exporter.image.tag | default (printf "v%s" .Chart.AppVersion) }}"
         imagePullPolicy: {{ .Values.exporter.image.pullPolicy }}
         ports:
         - containerPort: {{ .Values.service.targetPort }}

exporter/Dockerfile

@@ -8,7 +8,7 @@ WORKDIR /app
 # Minimal dependencies for builder stage if any Python packages had C extensions.
 # Assuming requirements.txt does not need gcc or other build tools for now.
 # If pip install fails later, add necessary build tools (e.g., gcc, python3-dev) here.
-RUN apt-get update &&
+RUN apt-get update && \
     # apt-get install -y --no-install-recommends gcc python3-dev # Example if needed
     rm -rf /var/lib/apt/lists/*
 
@@ -23,8 +23,8 @@ WORKDIR /app
 
 # Install iperf3 and its runtime dependency libsctp1 directly in the final stage.
 # This simplifies the Dockerfile by removing the need to copy iperf3 components from the builder.
-RUN apt-get update &&
+RUN apt-get update && \
-    apt-get install -y --no-install-recommends iperf3 libsctp1 &&
+    apt-get install -y --no-install-recommends iperf3 libsctp1 && \
     rm -rf /var/lib/apt/lists/*
 
 # Copy installed Python packages from the builder stage