feat!: replace args with config file (#162)

* feat!: replace args with config file

This commit replaces all cli arguments with a single config file to
simplify the deployment process and make future iterations on config
easier to sync across projects using the MCP server.

BREAKING: Users now need to create a config file instead of using CLI
arguments.


Co-authored-by: Matthew Hawkins <[email protected]>

Author: nicholascioli

.changesets/breaking_nc_config_file.md

@@ -0,0 +1,41 @@
+### Replace CLI flags with a configuration file - @nicholascioli PR #162
+
+All command line arguments are now removed and replaced with equivalent configuration
+options. The Apollo MCP server only accepts a single argument which is a path to a
+configuration file. An empty file may be passed, as all options have sane defaults
+that follow the previous argument defaults.
+
+Below is a valid configuration file with some options filled out:
+
+```yaml
+custom_scalars: /path/to/custom/scalars
+endpoint: http://127.0.0.1:4000
+graphos:
+  apollo_key: some.key
+  apollo_graph_ref: example@graph
+headers:
+  X-Some-Header: example-value
+introspection:
+  execute:
+    enabled: true
+  introspect:
+    enabled: false
+log_level: info
+operations:
+  source: local
+  paths:
+    - /path/to/operation.graphql
+    - /path/to/other/operation.graphql
+overrides:
+  disable_type_description: false
+  disable_schema_description: false
+  enable_explorer: false
+  mutation_mode: all
+schema:
+  source: local
+  path: /path/to/schema.graphql
+transport:
+  type: streamable_http
+  address: 127.0.0.1
+  port: 5000
+```

Cargo.lock

@@ -21,6 +21,7 @@ reqwest = { version = "0.12.15", default-features = false, features = [
   "json",
   "native-tls-vendored",
 ] }
+secrecy = { version = "0.10.3", features = ["serde"] }
 serde = { version = "1.0.219", features = ["derive"] }
 serde_json = "1.0.140"
 thiserror = "2.0.12"
@@ -39,7 +40,7 @@ tokio-stream = "0.1"
 tracing = "0.1.41"
 tracing-core = "0.1.33"
 tracing-subscriber = { version = "0.3.19", features = ["json"] }
-url = "2.4"
+url = { version = "2.4", features = ["serde"] }
 
 [workspace.metadata]
 crane.name = "apollo-mcp"

Cargo.toml

@@ -18,7 +18,7 @@ graphql_client = "0.14.0"
 insta.workspace = true
 notify = "8.0.0"
 reqwest.workspace = true
-secrecy = "0.10.3"
+secrecy.workspace = true
 serde.workspace = true
 serde_json.workspace = true
 thiserror.workspace = true