Update artifact tag suffix and build folder name

Appends 'alpha' to artifact tag suffix for pull requests in the GitHub Action and changes the build folder name from 'build/Release' to 'build/release' in the Makefile for consistency.

.github/actions/upload-artifacts/action.yml

@@ -38,7 +38,7 @@ runs:
         echo "version=${VERSION}" >> "$GITHUB_OUTPUT"
         
         if [ "${{ github.event_name }}" == "pull_request" ]; then
-          TAG_SUFFIX="-${{ github.event.number }}"
+          TAG_SUFFIX="-${{ github.event.number }}alpha"
           PRERELEASE=true
         elif [ "${{ inputs.chain-network }}" != "mainnet" ]; then
           TAG_SUFFIX="-beta"

Makefile

@@ -15,7 +15,7 @@ TESTNET:= 0
 STATIC:= 0
 BUILD_TYPE ?=Release
 BUILD_VERSION:=6.0.1
-BUILD_FOLDER:=build/Release
+BUILD_FOLDER:=build/release
 
 # -----------------------------------------------------------------
 # Unix‑like systems (Linux, macOS, *BSD, etc.)