ci: add top comments to GH Actions workflows

.github/workflows/ci.yml

@@ -1,3 +1,7 @@
+# GitHub Actions workflow to
+# lint Rust and Python code
+# and run Rust tests, Python tests and async Python tests.
+
 name: Rust CI
 
 # Cancel previously started workflow runs

.github/workflows/deltachat-rpc-server.yml

@@ -1,4 +1,10 @@
-# Manually triggered action to build deltachat-rpc-server binaries.
+# GitHub Actions workflow
+# to build `deltachat-rpc-server` binaries
+# and upload them to the release.
+#
+# The workflow is automatically triggered on releases.
+# It can also be triggered manually
+# to produce binary artifacts for testing.
 
 name: Build deltachat-rpc-server binaries
 

.github/workflows/dependabot.yml

@@ -1,3 +1,6 @@
+# GitHub Actions workflow
+# to automatically approve PRs made by Dependabot.
+
 name: Dependabot auto-approve
 on: pull_request
 

.github/workflows/node-docs.yml

@@ -1,3 +1,8 @@
+# GitHub Actions workflow to build
+# Node.js bindings documentation
+# and upload it to the web server.
+# Built documentation is available at <https://js.delta.chat/>
+
 name: Generate & upload node.js documentation
 
 on:

.github/workflows/node-tests.yml

@@ -1,3 +1,6 @@
+# GitHub Actions workflow
+# to test Node.js bindings.
+
 name: "node.js tests"
 
 # Cancel previously started workflow runs

.github/workflows/repl.yml

@@ -1,4 +1,5 @@
-# Manually triggered action to build a Windows repl.exe which users can
+# Manually triggered GitHub Actions workflow
+# to build a Windows repl.exe which users can
 # download to debug complex bugs.
 
 name: Build Windows REPL .exe

.github/workflows/upload-ffi-docs.yml

@@ -1,3 +1,7 @@
+# GitHub Actions workflow
+# to build `deltachat_fii` crate documentation
+# and upload it to <https://cffi.delta.chat/>
+
 name: Build & Deploy Documentation on cffi.delta.chat
 
 on: