Make package publishing idempotent [skip ci]

.gitea/workflows/build.yml

@@ -112,6 +112,14 @@ jobs:
           package_url="$package_server/api/packages/$GITEA_OWNER/generic/bdrclone/$package_version"
 
           for package_file in dist/*.tar.gz dist/SHA256SUMS; do
+            package_file_url="$package_url/$(basename "$package_file")"
+            if curl --fail --silent --head \
+              --header "Authorization: token $GITEA_TOKEN" \
+              --header "Host: $gitea_host" \
+              "$package_file_url" >/dev/null; then
+              echo "Package file already exists: $(basename "$package_file")"
+              continue
+            fi
             curl --fail-with-body --silent --show-error \
               --retry 5 --retry-all-errors --retry-delay 3 \
               --connect-timeout 20 --max-time 300 \
@@ -119,16 +127,25 @@ jobs:
               --header "Authorization: token $GITEA_TOKEN" \
               --header "Host: $gitea_host" \
               --upload-file "$package_file" \
-              "$package_url/$(basename "$package_file")"
+              "$package_file_url"
           done
 
-          curl --fail-with-body --silent --show-error \
-            --retry 5 --retry-all-errors --retry-delay 3 \
-            --connect-timeout 20 --max-time 300 \
-            --request POST \
-            --header "Authorization: token $GITEA_TOKEN" \
-            --header "Host: $gitea_host" \
-            "$package_server/api/v1/packages/$GITEA_OWNER/generic/bdrclone/-/link/$repository_name"
+          linked_repository="$(
+            curl --fail --silent --show-error \
+              --header "Authorization: token $GITEA_TOKEN" \
+              --header "Host: $gitea_host" \
+              "$package_server/api/v1/packages/$GITEA_OWNER/generic/bdrclone/$package_version" \
+              | jq --raw-output '.repository.full_name // ""'
+          )"
+          if [[ "$linked_repository" != "$GITEA_REPOSITORY" ]]; then
+            curl --fail-with-body --silent --show-error \
+              --retry 5 --retry-all-errors --retry-delay 3 \
+              --connect-timeout 20 --max-time 300 \
+              --request POST \
+              --header "Authorization: token $GITEA_TOKEN" \
+              --header "Host: $gitea_host" \
+              "$package_server/api/v1/packages/$GITEA_OWNER/generic/bdrclone/-/link/$repository_name"
+          fi
 
       - name: Upload temporary build artifacts
         if: ${{ !startsWith(github.ref, 'refs/tags/v') && inputs.publish_version == '' }}