Add --dev CLI flag to pageserver and safekeeper binaries (#11526)

# Add --dev CLI flag to pageserver and safekeeper binaries

This PR adds the `--dev` CLI flag to both the pageserver and safekeeper
binaries without implementing any functionality yet. This is a precursor
to PR #11517, which will implement the full functionality to require
authentication by default unless the `--dev` flag is specified.

## Changes
- Add `dev_mode` config field to pageserver binary
- Add `--dev` CLI flag to safekeeper binary

This PR is needed for forward compatibility tests to work properly, when
we try to merge #11517

Link to Devin run:
https://app.devin.ai/sessions/ad8231b4e2be430398072b6fc4e85d46
Requested by: John Spray (john@neon.tech)

---------

Co-authored-by: Devin AI <158243242+devin-ai-integration[bot]@users.noreply.github.com>
Co-authored-by: John Spray <john@neon.tech>

libs/pageserver_api/src/config.rs

@@ -181,6 +181,7 @@ pub struct ConfigToml {
     pub generate_unarchival_heatmap: Option<bool>,
     pub tracing: Option<Tracing>,
     pub enable_tls_page_service_api: bool,
+    pub dev_mode: bool,
 }
 
 #[derive(Debug, Clone, PartialEq, Eq, serde::Serialize, serde::Deserialize)]
@@ -657,6 +658,7 @@ impl Default for ConfigToml {
             generate_unarchival_heatmap: None,
             tracing: None,
             enable_tls_page_service_api: false,
+            dev_mode: false,
         }
     }
 }

pageserver/src/config.rs

@@ -225,6 +225,11 @@ pub struct PageServerConf {
     /// Does not force TLS: the client negotiates TLS usage during the handshake.
     /// Uses key and certificate from ssl_key_file/ssl_cert_file.
     pub enable_tls_page_service_api: bool,
+
+    /// Run in development mode, which disables certain safety checks
+    /// such as authentication requirements for HTTP and PostgreSQL APIs.
+    /// This is insecure and should only be used in development environments.
+    pub dev_mode: bool,
 }
 
 /// Token for authentication to safekeepers
@@ -398,6 +403,7 @@ impl PageServerConf {
             generate_unarchival_heatmap,
             tracing,
             enable_tls_page_service_api,
+            dev_mode,
         } = config_toml;
 
         let mut conf = PageServerConf {
@@ -449,6 +455,7 @@ impl PageServerConf {
             get_vectored_concurrent_io,
             tracing,
             enable_tls_page_service_api,
+            dev_mode,
 
             // ------------------------------------------------------------
             // fields that require additional validation or custom handling

safekeeper/src/bin/safekeeper.rs

@@ -226,11 +226,16 @@ struct Args {
     /// Path to the JWT auth token used to authenticate with other safekeepers.
     #[arg(long)]
     auth_token_path: Option<Utf8PathBuf>,
+
     /// Enable TLS in WAL service API.
     /// Does not force TLS: the client negotiates TLS usage during the handshake.
     /// Uses key and certificate from ssl_key_file/ssl_cert_file.
     #[arg(long)]
     enable_tls_wal_service_api: bool,
+
+    /// Run in development mode (disables security checks)
+    #[arg(long, help = "Run in development mode (disables security checks)")]
+    dev: bool,
 }
 
 // Like PathBufValueParser, but allows empty string.