add action workflow and change Docker file name

.gitea/workflows/build_nopush.yml

@@ -0,0 +1,46 @@
+name: Create postgresql docker image
+run-name: ${{ gitea.actor }} is testing out Gitea Actions 🚀
+on:
+  push:
+    branches:
+      - devel
+    paths:
+      - "Dockerfile"
+
+jobs:
+  Explore-Gitea-Actions:
+    runs-on: ubuntu-latest
+    env:
+      REGISTRY: registry.tuxnet.lan
+      IMAGE: db/pg_dump
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v2
+
+      - name: Set up Docker BuildX
+        uses: docker/setup-buildx-action@v2
+        with: # replace it with your local IP
+          config-inline: |
+            [registry."registry.tuxnet.lan"] 
+              http = true
+              insecure = true
+
+      - name: Set Docker Version
+        id: get_version
+        run: |
+          DOCKER_VERSION=$(grep -oP '(?<=^ARG VERSION=).*' Dockerfile)
+          echo "Docker version: $DOCKER_VERSION"
+          echo "::set-output name=tag::$DOCKER_VERSION"
+
+      - name: Build and push
+        uses: docker/build-push-action@v4
+        with:
+          context: .
+          file: ./Dockerfile
+          platforms: |
+            linux/amd64
+          push: false
+          tags: ${{ env.REGISTRY }}/${{ env.IMAGE }}:${{ steps.get_version.outputs.tag }}

Dockerfile

@@ -1,6 +1,7 @@
 FROM alpine:latest
 
 LABEL maintainer="development@cooltux.net"
+ARG VERSION=16-20240926
 
 # PostgreSQL-Client installieren
 RUN apk update ; \