tools/docker: use correct branch and commit of IDF when building

tools/docker/hooks/build

@@ -0,0 +1,14 @@
+#!/bin/bash
+
+# This file gets executed to build the image on the Docker Hub.
+# See https://docs.docker.com/docker-hub/builds/advanced/#build-hook-examples for details.
+
+set -euo pipefail
+
+echo "Building for branch ${SOURCE_BRANCH}, commit ${SOURCE_COMMIT}"
+
+docker build \
+    --build-arg IDF_CLONE_BRANCH_OR_TAG=${SOURCE_BRANCH} \
+    --build-arg IDF_CHECKOUT_REF=${SOURCE_COMMIT} \
+    -f $DOCKERFILE_PATH \
+    -t $IMAGE_NAME .