[WIP] workflows: run tag and build in one workflow

GitHub workflows are limited in that a workflow (here: tag) can not
trigger another workflow (here: build).

Both worked independently, yet the build workflow running "on" tag
"create" would only run upon push, not when the other worfklow created a
tag via the GitHub script.

To avoid managing personal access tokens, which would allow this, the
actions are merged into one.

The tag name is change to be more generic.

https://docs.github.com/en/actions/writing-workflows/choosing-when-your-workflow-runs/triggering-a-workflow#triggering-a-workflow-from-a-workflow

.github/workflows/easycloud-build.yml

@@ -23,18 +23,46 @@ on:
       - '**.js'
       - '**.ts'
       - '**.vue'
-  create:
-    tags:
-      - v1*
-      - v2*
-      - v3*
-      - snap-*
+  push:
+    branches:
+      # Enable once approved
+      # - ionos-dev
+      - tl/workflow-build-snapshots-with-releases
 
 env:
   PACKAGE_NAME_PREFIX: easy-storage
   PACKAGE_NAME_EXTENSION: zip
 
 jobs:
+  # Having a tag is necessary to create a release otherwise this error is thrown:
+  # "⚠️ GitHub Releases requires a tag"
+  snapshot-tag:
+    runs-on: ubuntu-latest
+
+    permissions:
+      contents: write
+
+    name: snapshot-tag
+    steps:
+      - name: Create tag
+        uses: actions/github-script@v7
+        with:
+          # https://octokit.github.io/rest.js/v21/#git-create-tag
+          script: |
+            const dateStr = new Date()
+                              .toISOString()
+                              .replace(/^(\d+)-(\d+)-(\d+)T(\d+):(\d+):(\d+).*$/, "$1$2$3-$4$5$6");
+
+            github.rest.git.createRef({
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              message: 'Snapshot build',
+              ref: `refs/tags/rel-${dateStr}`,
+              sha: context.sha
+            });
+
+  # Build and create release
+  #
   easycloud-build:
     runs-on: ubuntu-latest
 
@@ -97,7 +125,6 @@ jobs:
 
       - name: Release
         uses: softprops/action-gh-release@v2
-        if: startsWith(github.ref, 'refs/tags/')
         with:
           files: ${{ env.PACKAGE_NAME }}