Update .ci/prepare_build_dir.sh, .ci/build_pkgs.sh, .ci/download_sdk.sh files

.ci/build_pkgs.sh

@@ -1,5 +1,6 @@
-cd /builds/$CI_PROJECT_PATH/wireless/
-PKGS=$(ls)
+OPWD=$PWD
+
+PKGS=$(ls wireless/)
 
 cd  tmp/build_dir
 
@@ -31,4 +32,6 @@ done
 for PKG in $PKGS ; do
     echo "===+ Building: $PKG"
     make "package/$PKG/compile" -j3 V=s
-done
+done
+
+cd $OPWD

.ci/download_sdk.sh

@@ -1,3 +1,5 @@
+OPWD=$PWD
+
 mkdir tmp/sdk
 cd tmp/sdk
 
@@ -5,4 +7,6 @@ curl "https://$SDK_HOST/$SDK_PATH/sha256sums" -sS -o sha256sums
 curl "https://$SDK_HOST/$SDK_PATH/sha256sums.asc" -sS -o sha256sums.asc
 gpg --with-fingerprint --verify sha256sums.asc sha256sums
 rsync -av "$SDK_HOST::downloads/$SDK_PATH/$SDK_FILE" .
-sha256sum -c --ignore-missing sha256sums
+sha256sum -c --ignore-missing sha256sums
+
+cd $OPWD

.ci/prepare_build_dir.sh

@@ -1,3 +1,4 @@
+OPWD=$PWD
 mkdir tmp/build_dir
 cd  tmp/build_dir
 
@@ -19,4 +20,6 @@ cat feeds.conf
 ./scripts/feeds install -a > /dev/null
 
 make defconfig > /dev/null
-sed -i 's/# CONFIG_BUILD_LOG is not set/CONFIG_BUILD_LOG=y/' .config
+sed -i 's/# CONFIG_BUILD_LOG is not set/CONFIG_BUILD_LOG=y/' .config
+
+cd $OPWD