feat: make secure flag of cookie configurable (#26)

docs/integration/Docker.md

@@ -68,6 +68,9 @@ services:
       HOST: '0.0.0.0'
       PORT: '3000'
         
+      # Only set this to false if you aren't behind a reverse proxy
+      COOKIE_SECURE: 'false'
+
       # Overrides the configuration file values if they are set in config.yaml
       # If you want to share the same OIDC configuration you do not need this
       OIDC_CLIENT_ID: 'headscale'

docs/integration/Kubernetes.md

@@ -98,6 +98,10 @@ spec:
           valueFrom:
             fieldRef:
               fieldPath: metadata.name
+
+          # Only set this to false if you aren't behind a reverse proxy
+        - name: COOKIE_SECURE
+          value: 'false'
         volumeMounts:
         - name: headscale-config
           mountPath: /etc/headscale