Add Clean docker hub tags workflow

.github/workflows/clean-dockerhub-tag.yaml

@@ -0,0 +1,23 @@
+---
+name: Clean docker hub tags
+
+on: delete
+
+jobs:
+  clean:
+    runs-on: ubuntu-18.04
+    name: Clean docker hub tags
+    env:
+      SUMMON_PROVIDER: /usr/local/bin/gopass
+    steps:
+      - uses: actions/checkout@v1
+      - uses: camptocamp/initialise-gopass-summon-action@v1
+        with:
+          ci-gpg-private-key: ${{secrets.CI_GPG_PRIVATE_KEY}}
+          github-gopass-ci-token: ${{secrets.GITHUB_GOPASS_CI_TOKEN}}
+      - name: Clean docker hub tags
+        run: |
+          summon --yaml '
+            USERNAME: !var gs/ci/dockerhub/username
+            PASSWORD: !var gs/ci/dockerhub/password
+          ' scripts/clean-dockerhub-tag

ci/clean-dockerhub-tag

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+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+
+import json
+import os
+import re
+import subprocess
+import sys
+
+import requests
+
+
+def clean():
+    token = requests.post(
+        "https://hub.docker.com/v2/users/login/",
+        headers={"Content-Type": "application/json"},
+        data=json.dumps({"username": os.environ["USERNAME"], "password": os.environ["PASSWORD"]}),
+    ).json()["token"]
+
+    with open(os.environ["GITHUB_EVENT_PATH"]) as event_file:
+        ref = json.loads(event_file.read())["ref"]
+
+    ref = ref.replace("/", "_")
+
+    print("Delete image 'camptocamp/c2cwsgiutils:{}'.".format(ref))
+
+    response = requests.head(
+        "https://hub.docker.com/v2/repositories/camptocamp/c2cwsgiutils/tags/{tag}/".format(tag=ref),
+        headers={"Authorization": "JWT " + token},
+    )
+    if response.status_code == 404:
+        return
+    if not response.ok:
+        print("Error checking image 'camptocamp/c2cwsgiutils:{}' status.".format(ref))
+        print(response.text)
+        sys.exit(2)
+
+    response = requests.delete(
+        "https://hub.docker.com/v2/repositories/camptocamp/c2cwsgiutils/tags/{tag}/".format(tag=ref),
+        headers={"Authorization": "JWT " + token},
+    )
+    if not response.ok:
+        print("Error on deleting tag: " + ref)
+        print(response.text)
+        sys.exit(2)
+
+
+clean()