Update Docker build args and testnet symlink logic

Adds build arguments to the Docker build workflow for testnet, threads, build target, and local build. Updates the Dockerfile to use the 'dev' branch by default and improves the testnet symlink creation logic to use sed for string replacement.

.github/workflows/build-docker.yml

@@ -43,5 +43,10 @@ jobs:
           file: utils/docker/images/lthn-chain/Dockerfile
           context: ${{ github.workspace }}
           push: true
+          build-args: |
+            BUILD_TESTNET=${{ inputs.chain-network == 'testnet' && '1' || '0' }}
+            THREADS=2
+            BUILD_TARGET=gcc-linux-x86_64
+            BUILD_LOCAL=1
           tags: lthn/chain:${{ inputs.chain-network == 'testnet' && 'testnet' || 'latest' }}
 

utils/docker/images/lthn-chain/Dockerfile

@@ -3,7 +3,7 @@ FROM ubuntu:24.04 AS builder
 LABEL authors="snider"
 
 ARG THREADS=1
-ARG BUILD_BRANCH=dev-configure-testnet-1
+ARG BUILD_BRANCH=dev
 ARG BUILD_LOCAL=1
 ARG BUILD_REPO=https://github.com/letheanVPN/blockchain.git
 ARG BUILD_TARGET=gcc-linux-x86_64
@@ -52,7 +52,7 @@ RUN cmake --build ${BUILD_FOLDER} --config=${BUILD_TYPE} --parallel=${THREADS}
 RUN if [ "$BUILD_TESTNET" = "1" ]; then \
       cd ${BUILD_FOLDER}/src && \
       for f in lethean-testnet-*; do \
-        ln -s "$f" "${f/-testnet/}"; \
+        ln -s "$f" "$(echo "$f" | sed 's/-testnet//')"; \
       done; \
     fi