chore: strip CR/LF when reading smtp_r VERSION file

Builds on Windows-edited VERSION files were producing tags like
"1.0.0\r-legacy" that buildx rejected. Normalise the VERSION file to LF
and harden the workflow with `tr -d '\r\n'`.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: joamag

.github/workflows/dockerx_smtp_r.yml

@@ -33,7 +33,7 @@ jobs:
           password: ${{ secrets.DOCKERHUB_TOKEN }}
       - name: Read image version
         id: version
-        run: echo "version=$(cat ${{ matrix.config.context }}/VERSION)" >> $GITHUB_OUTPUT
+        run: echo "version=$(tr -d '\r\n' < ${{ matrix.config.context }}/VERSION)" >> $GITHUB_OUTPUT
       - name: Set tag names based on branch
         id: set_tag
         run: |

smtp_r/VERSION

@@ -1 +1 @@
-1.0.0
+1.0.0