Update build mechanism

Author: cthoyt

.github/workflows/example-doc.yml

@@ -27,16 +27,34 @@ jobs:
       # updates to the templates. This workflow does not
       # push new images to dockerhub at all, hence why we
       # don't prefix this like openjournals/inara:<tag>
-      - name: Build docker
-        run: |
-          docker build -t inara:edgiest .
+      - name: Docker meta
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: |
+            openjournals/inara
+            ghcr.io/openjournals/inara
+          tags: |
+            type=semver,pattern={{version}}
+            type=edge
+            type=ref,event=branch
+            type=ref,event=pr
+
+      - name: Build image
+        id: push
+        uses: docker/build-push-action@v5
+        with:
+          context: "."
+          push: false
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}
 
       - name: Build draft PDF
         run: >-
           docker run \
               --volume "$(pwd):/data" \
               --user "$(id -u):$(id -g)" \
-              inara:edgiest \
+              ${{ fromJSON(steps.meta.outputs.json).tags[0] }} \
               -o "jats,contextpdf,crossref,preprint,tex,pdf" example/paper.md
 
       - name: Upload draft PDF
@@ -56,7 +74,7 @@ jobs:
           docker run \
               --volume "$(pwd):/data" \
               --user "$(id -u):$(id -g)" \
-              inara:edgiest \
+              ${{ fromJSON(steps.meta.outputs.json).tags[0] }} \
               -o "jats,contextpdf,crossref,preprint,tex,pdf" -p example/paper.md
 
       - name: Upload production PDF