Modify Docker release GitHub workflow triggers (#19)

Triggers for the Docker release GitHub workflow have been altered. It
has been simplified to perform actions only on pushes to the 'master'
branch. Authenticated Docker Hub login and automatic pushes are still
operational, however, pull request triggers have been removed.
Plugin-specific docker meta actions and related steps are also removed.

.github/workflows/release-docker.yml

@@ -13,44 +13,22 @@
 name: Publish Docker
 
 on:
-  release:
-    types: [ published ]
   push:
     branches:
-      - "*"
-  pull_request:
-    branches:
-      - "master"
+      - 'master'
 
 jobs:
   docker:
     name: Docker
     runs-on: ubuntu-latest
     steps:
-      - name: Checkout
-        uses: actions/checkout@v4
-
-      - name: Docker meta
-        id: meta
-        uses: docker/metadata-action@v5
-        with:
-          images: jbzoo/csv-blueprint
-          tags: |
-            type=ref,event=branch
-            type=ref,event=pr
-            type=semver,pattern={{version}}
-            type=semver,pattern={{major}}.{{minor}}
-            type=semver,pattern={{major}}
-            type=sha
-
       - name: Set up QEMU
         uses: docker/setup-qemu-action@v3
 
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v3
 
       - name: Login to Docker Hub
-        # if: github.event_name != 'pull_request'
         uses: docker/login-action@v3
         with:
           username: ${{ secrets.DOCKERHUB_USERNAME }}
@@ -60,6 +38,5 @@ jobs:
         uses: docker/build-push-action@v5
         with:
           context: .
-          # push: ${{ github.event_name != 'pull_request' }}
-          tags: ${{ steps.meta.outputs.tags }}
-          labels: ${{ steps.meta.outputs.labels }}
+          push: true
+          tags: jbzoo/csv-blueprint:latest