CI: Remove the deprecated cml-publish command from the dvc-diff workflow (#2559)

Author: seisman

.github/workflows/dvc-diff.yml

@@ -32,9 +32,6 @@ jobs:
     - name: Setup continuous machine learning (CML)
       uses: iterative/setup-cml@v1.2.3
 
-    - name: Pull image data from cloud storage
-      run: dvc pull --remote upstream
-
     # workaround from https://github.com/iterative/cml/issues/1377
     - name: Setup NodeJS
       uses: actions/setup-node@v1
@@ -65,43 +62,40 @@ jobs:
       run: |
         echo -e "## Summary of changed images\n" > report.md
         echo -e "This is an auto-generated report of images that have changed on the DVC remote\n" >> report.md
+
+        # Pull image data from cloud storage
+        dvc pull --remote upstream
         dvc diff --show-md main HEAD >> report.md
 
         # Get just the filename of the added and modified image from the report
         awk 'NF==5 && NR>=7 && $2=="added" {print $4}' report.md > added_files.txt
         awk 'NF==5 && NR>=7 && $2=="modified" {print $4}' report.md > modified_files.txt
 
+        # Backup new images in the baseline-new directory
+        mkdir pygmt/tests/baseline-new
+        cp pygmt/tests/baseline/*.png pygmt/tests/baseline-new/
+        # Pull images in the main branch from cloud storage
+        git checkout main
+        dvc pull --remote upstream
+
         # Append each image to the markdown report
         echo -e "## Image diff(s)\n" >> report.md
         echo -e "<details>\n" >> report.md
 
         # Added images
         echo -e "### Added images\n" >> report.md
         while IFS= read -r line; do
-          echo -e "- $line \n" >> report.md
-          cml-publish --title $line --md "$line" >> report.md < /dev/null
+          echo -e "- $(basename $line) \n" >> report.md
+          echo -e "![](${line/baseline/baseline-new})" >> report.md
         done < added_files.txt
 
         # Modified images
         echo -e "### Modified images\n" >> report.md
-        # Upload new images
-        while IFS= read -r line; do
-          cml-publish --title $line --md "$line" >> modified_images_new.md < /dev/null
-        done < modified_files.txt
-
-        # Pull images in the main branch from cloud storage
-        git checkout main
-        dvc pull --remote upstream
-        # Upload old images
-        while IFS= read -r line; do
-          cml-publish --title $line --md "$line" >> modified_images_old.md < /dev/null
-        done < modified_files.txt
-
-        # Append image report for modified images
         echo -e "| Path | Old | New |" >> report.md
         echo -e "|---|---|---|" >> report.md
-        paste modified_files.txt modified_images_old.md modified_images_new.md -d"|" |
-          awk -F"|" 'function basename(file) {sub(".*/", "", file); return file} {printf("| %s | %s | %s |\n",  basename($1), $2, $3)}' >> report.md
+        while IFS= read -r line; do
+          echo -e "| $(basename $line) | ![]($line) | ![](${line/baseline/baseline-new}) |" >> report.md
+        done < modified_files.txt
 
         echo -e "</details>\n" >> report.md