add El SDK CI/CD pipeline and install script

- .gitea/workflows/sdk-release.yaml: build elc from bootstrap, run tests,
  publish latest release, dispatch el-sdk-updated to downstream repos
- install.sh: one-command El SDK install from Gitea release

dist/platform/elc-asan.dSYM/Contents/Info.plist

@@ -0,0 +1,20 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple Computer//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+	<dict>
+		<key>CFBundleDevelopmentRegion</key>
+		<string>English</string>
+		<key>CFBundleIdentifier</key>
+		<string>com.apple.xcode.dsym.elc-asan</string>
+		<key>CFBundleInfoDictionaryVersion</key>
+		<string>6.0</string>
+		<key>CFBundlePackageType</key>
+		<string>dSYM</string>
+		<key>CFBundleSignature</key>
+		<string>????</string>
+		<key>CFBundleShortVersionString</key>
+		<string>1.0</string>
+		<key>CFBundleVersion</key>
+		<string>1</string>
+	</dict>
+</plist>

dist/platform/elc-asan.dSYM/Contents/Resources/Relocations/aarch64/elc-asan.yml

@@ -0,0 +1,5 @@
+---
+triple:          'arm64-apple-darwin'
+binary-path:     '/Users/will/Development/neuron-technologies/foundation/el/dist/platform/elc-asan'
+relocations:     []
+...