improve helm chart default image tag

upgrade packages during container image build to hopefully address some
security issues.

Signed-off-by: Alexander Trost <[email protected]>

Author: galexrt

Dockerfile

@@ -1,4 +1,4 @@
-FROM debian:bullseye-slim
+FROM debian:bookworm-slim
 
 ARG BUILD_DATE="N/A"
 ARG REVISION="N/A"
@@ -15,6 +15,7 @@ LABEL org.opencontainers.image.authors="Alexander Trost <[email protected]>
     org.opencontainers.image.version="N/A"
 
 RUN apt-get -q update && \
+    apt-get -q upgrade -y && \
     apt-get install -y --no-install-recommends \
         ca-certificates \
         git \

charts/node-exporter-textfiles/values.yaml

@@ -7,8 +7,10 @@ replicaCount: 1
 image:
   repository: quay.io/galexrt/node-exporter-textfiles
   pullPolicy: IfNotPresent
-  # Overrides the image tag whose default is the chart appVersion.
-  tag: ""
+  # By default `main` is a moving image tag, I would recommend to use a
+  # specific tag from here:
+  # https://quay.io/repository/galexrt/node-exporter-textfiles?tab=tags
+  tag: "main"
 
 imagePullSecrets: []
 nameOverride: ""