Add migration scripts and manifests for GitLab and Gitea to Longhorn

- Create .vscode/settings.json for YAML schema validation.
- Add WISSENSBASIS.md for documentation on HomeLabScripts.
- Implement migration job for GitLab from NFS to Longhorn with migrate-to-longhorn.yaml and migrate-to-longhorn.sh.
- Add Gitea migration scripts and manifests for PostgreSQL to Longhorn.
- Create persistent volume claims and deployments for Gitea and Homarr.
- Set up namespaces and services for Homarr and Speedtest Tracker.
- Add secrets for Homarr and Speedtest Tracker with sensitive data.
- Configure Ingress for Speedtest Tracker with Traefik annotations.

Co-authored-by: Copilot <copilot@github.com>

k3s/apps/gitea/migrate-postgres-to-longhorn.yaml

@@ -0,0 +1,50 @@
+apiVersion: batch/v1
+kind: Job
+metadata:
+  name: gitea-postgres-migrate-to-longhorn
+  namespace: gitea
+spec:
+  backoffLimit: 2
+  template:
+    metadata:
+      name: gitea-postgres-migrate-to-longhorn
+    spec:
+      restartPolicy: Never
+      containers:
+        - name: migrate
+          image: alpine:3.20
+          command:
+            - sh
+            - -c
+            - |
+              set -euo pipefail
+              apk add --no-cache rsync findutils coreutils
+
+              src_count="$(find /source -mindepth 1 | wc -l | tr -d ' ')"
+              echo "Source entries before copy: ${src_count}"
+
+              rsync -aHAX --numeric-ids --delete /source/ /target/
+
+              target_count="$(find /target -mindepth 1 | wc -l | tr -d ' ')"
+              echo "Target entries after copy: ${target_count}"
+
+              test -f /target/PG_VERSION
+              test -d /target/base
+              test "${target_count}" -gt 0
+
+              echo "Top-level target contents:"
+              ls -la /target
+              echo "Migration verification successful"
+          volumeMounts:
+            - name: source
+              mountPath: /source
+              readOnly: true
+            - name: target
+              mountPath: /target
+      volumes:
+        - name: source
+          persistentVolumeClaim:
+            claimName: postgres-pvc
+        - name: target
+          persistentVolumeClaim:
+            claimName: postgres-longhorn-pvc