Update CI actions using Docker script

actions/Dockerfile

@@ -0,0 +1,53 @@
+# This Dockerfile can be used to quickly generate the needed artifacts when
+# updating `notify-workflow-completed`, `run-workflow` and `upstream-builds-query`
+# custom GH actions after changes in the `./config/config.json` file.
+# To update the artifacts:
+# 1. Push the modified `./config/config.json` to a feature branch.
+# 2. Provide the name of the feature branch to the `BRANCH_NAME` parameter below.
+# 3. Build the Docker image by executing the following command from the
+#    `./actions` folder:
+#      ```
+#      docker build --tag actions .
+#      ```
+# 4. Run the built Docker image (the container will run in the background and
+#    will update the code of the actions):
+#      ```
+#      docker run -d actions
+#      ```
+# 5. Within 5 min list the run Docker conteiners and copy the container id:
+#      ```
+#      docker ps
+#      ```
+# 6. Replace the container id in the below commands and run them from the
+#    the `./actions` folder. The commands will copy the updated `dist` folders
+#    from the container filesystem to your local code.
+#      ```
+#      docker cp 66c205e35635:/workdir/ci/actions/notify-workflow-completed/dist/ ./notify-workflow-completed
+#      docker cp 66c205e35635:/workdir/ci/actions/run-workflow/dist/ ./run-workflow             
+#      docker cp 66c205e35635:/workdir/ci/actions/upstream-builds-query/dist/ ./upstream-builds-query
+#      ```
+# 7. Commit & push the changes in the actions to your feature branch.
+
+FROM node:14-alpine3.13 AS build
+
+ENV BRANCH_NAME=feature_branch_with_the_new_config
+
+RUN apk add --update --no-cache \
+  git \
+  bash
+
+WORKDIR /workdir
+
+RUN git clone https://github.com/keep-network/ci -b $BRANCH_NAME
+
+WORKDIR ci/actions/notify-workflow-completed
+RUN yarn install
+RUN yarn run prepare
+WORKDIR ../run-workflow
+RUN yarn install
+RUN yarn run prepare
+WORKDIR ../upstream-builds-query
+RUN yarn install
+RUN yarn run prepare
+
+CMD sleep 300