Fix init container: use Alpine for proper TLS/redirect support

Busybox 1.31.1 wget doesn't follow Caddy's HTTP→HTTPS redirect.
Switch to Alpine 3.21 which has a full wget with TLS support, and
use the HTTPS URL directly.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

argocd/manifests/grafana/deployment.yaml

@@ -48,14 +48,14 @@ spec:
         # Fetch TeslaMate dashboards from forge mirror at a pinned tag.
         # To upgrade: update TESLAMATE_VERSION below.
         - name: init-teslamate-dashboards
-          image: docker.io/library/busybox:kustomized
+          image: docker.io/library/alpine:3.21
           imagePullPolicy: IfNotPresent
           command: ["sh", "-c"]
           args:
             - |
               set -e
               TESLAMATE_VERSION="v3.0.0"
-              BASE_URL="http://forge.ops.eblu.me/mirrors/teslamate/raw/tag/${TESLAMATE_VERSION}/grafana/dashboards"
+              BASE_URL="https://forge.ops.eblu.me/mirrors/teslamate/raw/tag/${TESLAMATE_VERSION}/grafana/dashboards"
               DEST="/tmp/dashboards/TeslaMate"
               mkdir -p "$DEST"
               for f in \