Adding Docker autobuild

.gitlab-ci.yml

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+###############################################################
+# Setting I use for cleaning up image tags                    #
+# - Running cleanup every week                                #
+# - Keeping 1 tag per image name matching : (?:v.\d+|dev)     #
+# - Removing tags older than 7 days matching the default : .* #
+###############################################################
+
+image: docker:stable
+
+stages:
+  - build
+  - push
+
+services:
+  - docker:dind
+
+before_script:
+  - echo -n $CI_JOB_TOKEN | docker login -u gitlab-ci-token --password-stdin $CI_REGISTRY
+
+Build:
+  stage: build
+  script:
+    - docker pull $CI_REGISTRY_IMAGE:latest || true
+    - >
+      docker build
+      --pull
+      --build-arg VCS_REF=$CI_COMMIT_SHA
+      --build-arg VCS_URL=$CI_PROJECT_URL
+      --cache-from $CI_REGISTRY_IMAGE:latest
+      --tag $CI_REGISTRY_IMAGE:$CI_COMMIT_SHA
+      .
+    - docker push $CI_REGISTRY_IMAGE:$CI_COMMIT_SHA
+
+Push latest:
+  variables:
+    GIT_STRATEGY: none
+  stage: push
+  only:
+    - main
+  script:
+    - docker pull $CI_REGISTRY_IMAGE:$CI_COMMIT_SHA
+    - docker tag $CI_REGISTRY_IMAGE:$CI_COMMIT_SHA $CI_REGISTRY_IMAGE:latest
+    - docker push $CI_REGISTRY_IMAGE:latest
+
+Push tag:
+  variables:
+    GIT_STRATEGY: none
+  stage: push
+  only:
+    - tags
+  script:
+    - docker pull $CI_REGISTRY_IMAGE:$CI_COMMIT_SHA
+    - docker tag $CI_REGISTRY_IMAGE:$CI_COMMIT_SHA $CI_REGISTRY_IMAGE:$CI_COMMIT_REF_NAME
+    - docker push $CI_REGISTRY_IMAGE:$CI_COMMIT_REF_NAME

Dockerfile

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+FROM python:3.9.5-slim
+
+COPY . .
+RUN pip install -r requirements.txt
+
+CMD [ "python", "-u", "./main.py" ]