precommit: Freeze tool versions

tools/precommit/Dockerfile

@@ -19,21 +19,23 @@ RUN export DEBIAN_FRONTEND=noninteractive DEBCONF_NONINTERACTIVE_SEEN=true && \
     shellcheck \
   && rm -rf /var/lib/apt/lists/*
 
-# Install MarkdownLint.
+# Install markdownlint-cli and dependencies.
 # https://github.com/DavidAnson/markdownlint
-# https://github.com/igorshubovych/markdownlint-cli
-RUN npm install -g markdownlint-cli
+# https://github.com/igorshubovych/markdownlint-cli 
+WORKDIR /opt/cp2k-precommit
+COPY package.json package-lock.json ./
+RUN npm install .
+RUN ln -s /opt/cp2k-precommit/node_modules/markdownlint-cli/markdownlint.js /usr/bin/markdownlint
 
-# Install Black Python Formatter.
+# Install black, flask, gunicorn, and dependencies.
 # https://github.com/psf/black
-RUN pip3 install black
+COPY requirements.txt .
+RUN pip3 install -r requirements.txt
 
 # Clone cp2k repository (needed for CI mode).
 RUN git clone --quiet --recursive --single-branch -b master https://github.com/cp2k/cp2k.git /workspace/cp2k
 
 # Install Flask app.
-RUN pip3 install flask gunicorn
-WORKDIR /opt/cp2k-precommit
 COPY precommit_server.py .
 
 ARG REVISION

tools/precommit/package.json

@@ -0,0 +1,20 @@
+{
+  "name": "cp2k-precommit",
+  "version": "1.0.0",
+  "description": "Tools used by the cp2k-precomit system",
+  "main": "index.js",
+  "repository": "",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "repository": {
+      "type": "git",
+      "url": ""
+   },
+  "keywords": [],
+  "author": "",
+  "license": "ISC",
+  "dependencies": {
+    "markdownlint-cli": "^0.23.2"
+  }
+}

tools/precommit/requirements.txt

@@ -0,0 +1,14 @@
+appdirs==1.4.4
+attrs==20.1.0
+black==19.10b0
+click==7.1.2
+Flask==1.1.2
+gunicorn==20.0.4
+itsdangerous==1.1.0
+Jinja2==2.11.2
+MarkupSafe==1.1.1
+pathspec==0.8.0
+regex==2020.7.14
+toml==0.10.1
+typed-ast==1.4.1
+Werkzeug==1.0.1