Refactor Github Actions workflow for clarity and flexibility (#111)

Changes have been made in the publish.yml of the Github Actions workflow
for better readability and flexibility. Specifically, Docker's build
matrix has been expanded and it now includes three platforms:
linux/amd64, linux/arm64/v8, and linux/386. Moreover, the job names have
been updated to more clearly reflect their operations.

.github/workflows/publish.yml

@@ -18,7 +18,7 @@ on:
 
 jobs:
   phar:
-    name: PHAR
+    name: Publish PHAR
     runs-on: ubuntu-latest
     steps:
       - name: Checkout code
@@ -47,14 +47,8 @@ jobs:
             ./build/csv-blueprint.phar
 
   docker:
-    name: Docker
+    name: Publish Docker
     runs-on: ubuntu-latest
-    strategy:
-      matrix:
-        platform:
-          - linux/amd64
-          - linux/arm64/v8
-          - linux/386
     steps:
       - name: Checkout code
         uses: actions/checkout@v4
@@ -82,7 +76,7 @@ jobs:
           tags: |
             jbzoo/csv-blueprint:latest
             jbzoo/csv-blueprint:${{ github.event.release.tag_name }}
-          platforms: ${{ matrix.platform }}
+          platforms: linux/amd64,linux/arm64/v8,linux/386
           build-args: |
             VERSION=${{ github.event.release.tag_name }}