Fix PR build workflow.

.github/workflows/build.yml

@@ -1,6 +1,6 @@
 name: Build
 
-on: [push, pull_request]
+on: pull_request
 
 jobs:
   build-upload:
@@ -19,5 +19,8 @@ jobs:
           sudo apt-get update
           sudo apt-get -y install libusb-1.0-0 cmake srecord
           pip install -U pyserial
+
       - name: Build
+        env:
+          PR_NUMBER: ${{ github.event.number }}
         run: ./scripts/build-firmware

.gitignore

@@ -51,3 +51,6 @@ private
 
 # NodeMCU
 nodemcu-firmware
+
+# IDE's
+.vscode

scripts/build-firmware

@@ -15,9 +15,13 @@ function usage() {
 set -e
 
 if ! git describe --exact-match --tags &> /dev/null; then
-BRANCH="$(git branch | sed -n -e 's/^\* \(.*\)/\1/p')"
+  if [[ -z "${PR_NUMBER}" ]]; then
+    BRANCH="$(git branch | sed -n -e 's/^\* \(.*\)/\1/p')"
+  else
+    BRANCH="PR-"${PR_NUMBER}
+  fi
 else
-BRANCH="$(git describe --exact-match --tags $(git log -n1 --pretty='%h'))"
+  BRANCH="$(git describe --exact-match --tags $(git log -n1 --pretty='%h'))"
 fi
 
 FW_TAG="3.0.0-release_20210201"