v0.7.9 - Optimize Docker build caching and enforce static binary usage

- Restructure Dockerfile.alpine-musl for better layer caching
  * Build dependencies (secp256k1, libwebsockets) in separate cached layers
  * Copy submodules before source files to maximize cache hits
  * Reduce rebuild time from ~2-3 minutes to ~10-15 seconds for source changes
- Remove 'musl' from binary names (c_relay_static_x86_64 instead of c_relay_static_musl_x86_64)
- Enforce static binary usage in make_and_restart_relay.sh
  * Remove all fallbacks to regular make builds
  * Exit with clear error if static binary not found
  * Ensures JSON1 extension is always available
- Fix build_static.sh hanging on ldd check with timeout
- Remove sudo usage from build_static.sh (assumes docker group membership)

These changes ensure consistent builds with JSON1 support and dramatically improve
development iteration speed through intelligent Docker layer caching.

make_and_restart_relay.sh

@@ -163,14 +163,15 @@ rm -f db/c_nostr_relay.db* 2>/dev/null
 echo "Embedding web files..."
 ./embed_web_files.sh
 
-# Build the project first - use static build by default
+# Build the project - ONLY static build
 echo "Building project (static binary with SQLite JSON1 extension)..."
 ./build_static.sh
 
-# Fallback to regular build if static build fails
+# Exit if static build fails - no fallback
 if [ $? -ne 0 ]; then
-    echo "Static build failed, falling back to regular build..."
-    make clean all
+    echo "ERROR: Static build failed. Cannot proceed without static binary."
+    echo "Please fix the build errors and try again."
+    exit 1
 fi
 
 # Restore database files if preserving
@@ -187,37 +188,32 @@ if [ $? -ne 0 ]; then
     exit 1
 fi
 
-# Check if relay binary exists after build - prefer static binary, fallback to regular
+# Check if static relay binary exists after build - ONLY use static binary
 ARCH=$(uname -m)
 case "$ARCH" in
     x86_64)
-        STATIC_BINARY="./build/c_relay_static_x86_64"
-        REGULAR_BINARY="./build/c_relay_x86"
+        BINARY_PATH="./build/c_relay_static_x86_64"
         ;;
     aarch64|arm64)
-        STATIC_BINARY="./build/c_relay_static_arm64"
-        REGULAR_BINARY="./build/c_relay_arm64"
+        BINARY_PATH="./build/c_relay_static_arm64"
         ;;
     *)
-        STATIC_BINARY="./build/c_relay_static_$ARCH"
-        REGULAR_BINARY="./build/c_relay_$ARCH"
+        BINARY_PATH="./build/c_relay_static_$ARCH"
         ;;
 esac
 
-# Prefer static binary if available
-if [ -f "$STATIC_BINARY" ]; then
-    BINARY_PATH="$STATIC_BINARY"
-    echo "Using static binary: $BINARY_PATH"
-elif [ -f "$REGULAR_BINARY" ]; then
-    BINARY_PATH="$REGULAR_BINARY"
-    echo "Using regular binary: $BINARY_PATH"
-else
-    echo "ERROR: No relay binary found. Checked:"
-    echo "  - $STATIC_BINARY"
-    echo "  - $REGULAR_BINARY"
+# Verify static binary exists - no fallbacks
+if [ ! -f "$BINARY_PATH" ]; then
+    echo "ERROR: Static relay binary not found: $BINARY_PATH"
+    echo ""
+    echo "The relay requires the static binary with JSON1 support."
+    echo "Please run: ./build_static.sh"
+    echo ""
     exit 1
 fi
 
+echo "Using static binary: $BINARY_PATH"
+
 echo "Build successful. Proceeding with relay restart..."
 
 # Kill existing relay if running - start aggressive immediately