diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index a8ec525b31714b12acb055b8a3f4f2012d6b0de0..f673c099b4682350060377c6cd273dec5a1b736b 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -1,3 +1,6 @@
+variables:
+  meeting_pattern: '/meeting.*/'
+
 workflow:
   rules:
     - if: $CI_PIPELINE_SOURCE == "merge_request_event"
@@ -38,7 +41,7 @@ generate_artefacts:
   stage: build
   interruptible: true
   rules:
-    - if: $CI_PIPELINE_SOURCE == 'merge_request_event'
+    - if: $CI_PIPELINE_SOURCE == 'merge_request_event' && $CI_MERGE_REQUEST_SOURCE_BRANCH_NAME !~ $meeting_pattern
   script:
     - echo $CI_PROJECT_ID
     - echo $CI_PROJECT_NAME
@@ -55,3 +58,26 @@ generate_artefacts:
       - "*.docx"
     name: $CI_MERGE_REQUEST_TITLE
     expire_in: 30 days
+
+generate_attachments:
+  image: "forge.etsi.org:5050/li/schemas-definitions/forgelib"
+  stage: build
+  interruptible: true
+  rules:
+    - if: $CI_PIPELINE_SOURCE == 'merge_request_event'
+    - if: $CI_MERGE_REQUEST_SOURCE_BRANCH_NAME =~ $meeting_pattern
+  script:
+    - echo $CI_PROJECT_ID
+    - echo $CI_PROJECT_NAME
+    - echo $CI_PROJECT_PATH
+    - echo $CI_PIPELINE_SOURCE
+    - echo $CI_OPEN_MERGE_REQUESTS
+    - echo $CI_MERGE_REQUEST_IID
+    - echo $CI_MERGE_REQUEST_SOURCE_BRANCH_NAME
+    - echo $ARTEFACT_NAME
+    - python create_attachments.py
+  artifacts:
+    untracked: true
+    paths:
+      - "*.zip"
+    expire_in: 30 days
diff --git a/create_attachments.py b/create_attachments.py
new file mode 100644
index 0000000000000000000000000000000000000000..4beaaa0d01c973b926697d7044f702396ce0e2d1
--- /dev/null
+++ b/create_attachments.py
@@ -0,0 +1,53 @@
+from io import BytesIO
+from pathlib import Path
+import zipfile
+
+# For ETSI portal attachments, a single zip archive is created which
+# contains:
+# - All files in the top-level spec directory
+# - A zipfile for each subdirectory, which contains all the files in that subdirectory
+# This second step is recursive, so each zip file contains only files and other zipfiles, never subdirectories
+# For an explanation as to *why* this is the case, speak to your ETSI technical officer.
+#
+# Example: Assuming the files for the portal attachment are of the following form:
+#
+# (contents of directory)
+# - top_level_file.ext
+# - subdirectory_1
+#   - subdirectory_1_file.ext
+# - subdirectory_2
+#   - subdirectory_2_file.ext
+# - TS 102 232-1
+#
+# ...then the correct form for ETSI portal attachments is as follows
+#
+# ts_xxxxxx_vxxyyzzp0.zip
+# which contains:
+# - top_level_file.ext
+# - subdirectory_1.zip
+#   (which contains)
+#   - subdirectory_1_file.ext
+# - subdirectory_2.zip
+#   (which contains)
+#   - subdirectory_2_file.ext
+
+
+def recursively_zip_directory(directory: Path, zipname: str, recursion=0):
+    buffer = BytesIO()
+    zip = zipfile.ZipFile(buffer, "a")
+    for f in directory.iterdir():
+        if f.is_file():
+            zip.write(f, f.name)
+        elif f.is_dir():
+            zipname = f.with_suffix(".zip").name
+            recurse_buffer = recursively_zip_directory(f, zipname, recursion + 1)
+            zip.writestr(zipname, recurse_buffer.getvalue())
+    return buffer
+
+
+if __name__ == "__main__":
+    for directory in Path(".").glob("1*"):
+        zip_name = f"ts_{directory.name}vXXYYZZp0.zip"
+        zip_buffer = recursively_zip_directory(directory, zip_name)
+        with open(zip_name, "wb") as f:
+            f.write(zip_buffer.getvalue())