chore: update dockerfile and requirements.txt

Dockerfile

@@ -1,6 +1,6 @@
 FROM python:3.8.5-alpine3.12
 
-LABEL maintainer "@fabdelgado <mail@fabdelgado.com>"
+LABEL maintainer="@fabdelgado <mail@fabdelgado.com>"
 
 RUN apk add --no-cache gcc musl-dev linux-headers
 
@@ -10,11 +10,10 @@ COPY . /usr/src/app
 
 RUN pip3 install --no-cache-dir -r requirements.txt
 
-ENV PORT 80
-ENV FLASK_APP main.py
+ENV FLASK_APP=main.py
 
-ENV FLASK_RUN_HOST 0.0.0.0
+ENV FLASK_RUN_HOST=0.0.0.0
 
 #prod
-CMD exec gunicorn --bind :$PORT --workers 1 --threads 8 --timeout 0 microblog:app
+CMD ["gunicorn",  "--bind",  ":80", "--workers", "1", "--threads", "8",  "--timeout", "0", "microblog:app"]
 

README.md

@@ -2,6 +2,21 @@
 Multilingual Flask Boilerplate with smart routing optimised for search engines and including separate URL’s for each language.
 I created this application as example code for a Medium article which is linked below.
 
+### Build
+
+```
+docker build -t flask-gunicorn-app .
+docker run -p 80:80 --name multilangapp flask-gunicorn-app
+```
+Results in:
+```
+[2025-07-24 16:20:00 +0000] [1] [INFO] Starting gunicorn 23.0.0
+[2025-07-24 16:20:00 +0000] [1] [INFO] Listening at: http://0.0.0.0:80 (1)
+[2025-07-24 16:20:00 +0000] [1] [INFO] Using worker: gthread
+[2025-07-24 16:20:00 +0000] [8] [INFO] Booting worker with pid: 8
+```
+The website is available at [http://0.0.0.0:80](http://0.0.0.0:80)
+
 ### Live Demo
 A live demo of the application can be found here:<br>
 http://schmidni.pythonanywhere.com/lang10

requirements.txt

@@ -13,7 +13,7 @@ Jinja2==2.11.3
 MarkupSafe==1.1.1
 mccabe==0.6.1
 oauthlib==3.1.0
-pkg-resources==0.0.0
+# pkg-resources==0.0.0
 pycodestyle==2.7.0
 pyflakes==2.3.0
 PyMySQL==1.0.2
@@ -28,3 +28,4 @@ toml==0.10.2
 tweepy==3.10.0
 urllib3==1.25.11
 Werkzeug==1.0.1
+gunicorn==23.0.0