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.

build_static.sh

@@ -53,17 +53,17 @@ ARCH=$(uname -m)
 case "$ARCH" in
     x86_64)
         PLATFORM="linux/amd64"
-        OUTPUT_NAME="c_relay_static_musl_x86_64"
+        OUTPUT_NAME="c_relay_static_x86_64"
         ;;
     aarch64|arm64)
         PLATFORM="linux/arm64"
-        OUTPUT_NAME="c_relay_static_musl_arm64"
+        OUTPUT_NAME="c_relay_static_arm64"
         ;;
     *)
         echo "WARNING: Unknown architecture: $ARCH"
         echo "Defaulting to linux/amd64"
         PLATFORM="linux/amd64"
-        OUTPUT_NAME="c_relay_static_musl_${ARCH}"
+        OUTPUT_NAME="c_relay_static_${ARCH}"
         ;;
 esac
 
@@ -107,14 +107,14 @@ $DOCKER_CMD build \
     --platform "$PLATFORM" \
     --target builder \
     -f "$DOCKERFILE" \
-    -t c-relay-musl-builder-stage:latest \
+    -t c-relay-static-builder-stage:latest \
     . > /dev/null 2>&1
 
 # Create a temporary container to copy the binary
-CONTAINER_ID=$($DOCKER_CMD create c-relay-musl-builder-stage:latest)
+CONTAINER_ID=$($DOCKER_CMD create c-relay-static-builder-stage:latest)
 
 # Copy binary from container
-$DOCKER_CMD cp "$CONTAINER_ID:/build/c_relay_static_musl" "$BUILD_DIR/$OUTPUT_NAME" || {
+$DOCKER_CMD cp "$CONTAINER_ID:/build/c_relay_static" "$BUILD_DIR/$OUTPUT_NAME" || {
     echo "ERROR: Failed to extract binary from container"
     $DOCKER_CMD rm "$CONTAINER_ID" 2>/dev/null
     exit 1
@@ -180,7 +180,7 @@ echo "Binary: $BUILD_DIR/$OUTPUT_NAME"
 echo "Size: $(du -h "$BUILD_DIR/$OUTPUT_NAME" | cut -f1)"
 echo "Platform: $PLATFORM"
 if [ "$TRULY_STATIC" = true ]; then
-    echo "Type: Fully static MUSL binary"
+    echo "Type: Fully static binary (Alpine MUSL-based)"
     echo "Portability: Works on ANY Linux distribution"
 else
     echo "Type: Static binary (may have minimal dependencies)"