Merge #36: fix: swift script unique subdir

2a67970 fix: swift script unique subdir (Matthew)

Pull request description:

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  ### Description

  Builds on #34 architecture, and #35 Satscard status command.

  Before this fix, a user might get this error when trying to use 2 swift frameworks created like we do on bdk-ffi bindings.

  bitcoindevkit/bdk-ffi#621

  Example: would prevent a user from using both bdk-swift and cktap-swift in their iOS app potentially.

  ### Notes to the reviewers

  <!-- In this section you can include notes directed to the reviewers, like explaining why some parts
  of the PR were done in a specific way -->

  ### Changelog notice

  <!-- Notice the release manager should include in the release tag message changelog -->
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  ### Checklists

  #### All Submissions:

  * [x] I've signed all my commits
  * [x] I followed the [contribution guidelines](https://github.com/notmandatory/rust-cktap/blob/master/CONTRIBUTING.md)
  * [ ] I ran `cargo fmt` and `cargo clippy` before committing

  #### New Features:

  * [ ] I've added tests for the new feature
  * [ ] I've added docs for the new feature

  #### Bugfixes:

  * [ ] This pull request breaks the existing API
  * [ ] I've added tests to reproduce the issue which are now passing
  * [ ] I'm linking the issue being fixed by this PR

ACKs for top commit:
  notmandatory:
    ACK 2a67970

Tree-SHA512: 9dce93e3e803c18a5fd7b20f5cbe9b8b5b22715c46a7f01bd11a78407bba65c57bb8483431ed4a9ce1c72992b8d1e42685128963a2443913d4e61139c46eb9cb

Author: notmandatory

cktap-swift/build-xcframework.sh

@@ -67,21 +67,30 @@ lipo target/aarch64-apple-darwin/${RELDIR}/${STATIC_LIB_FILENAME} \
 
 cd cktap-swift || exit
 
-# move cktap-ffi static lib header files to temporary directory
+# Unique subdir to prevent collisions
+UNIQUE_HEADER_SUBDIR="${NEW_HEADER_DIR}/${HEADER_BASENAME}"
+
+# Remove any previously generated headers to avoid duplicate module.modulemap files
+rm -rf "${NEW_HEADER_DIR:?}"/*
+
+mkdir -p "${UNIQUE_HEADER_SUBDIR}"
+
+# Move the header file into the unique subdirectory
 if [ -f "Sources/CKTap/${HEADER_FILENAME}" ]; then
-    mv "Sources/CKTap/${HEADER_FILENAME}" "${NEW_HEADER_DIR}/"
+    mv "Sources/CKTap/${HEADER_FILENAME}" "${UNIQUE_HEADER_SUBDIR}/"
 else
     echo "Warning: Could not find header file Sources/CKTap/${HEADER_FILENAME}"
 fi
 
-# Handle modulemap using the correct filename pattern
+# Handle modulemap using the correct filename pattern, placed inside unique subdirectory
 if [ -f "Sources/CKTap/${GENERATED_MODULEMAP}" ]; then
-    mv "Sources/CKTap/${GENERATED_MODULEMAP}" "${NEW_HEADER_DIR}/${MODULEMAP_FILENAME}"
+    mv "Sources/CKTap/${GENERATED_MODULEMAP}" "${UNIQUE_HEADER_SUBDIR}/${MODULEMAP_FILENAME}"
 else
     echo "Creating a standard module map."
-    echo "framework module ${NAME} { umbrella header \"${HEADER_FILENAME}\" export * }" > "${NEW_HEADER_DIR}/${MODULEMAP_FILENAME}"
+    echo "framework module ${NAME} { umbrella header \"${HEADER_FILENAME}\" export * }" > "${UNIQUE_HEADER_SUBDIR}/${MODULEMAP_FILENAME}"
 fi
 
+
 # remove old xcframework directory
 rm -rf "${OUTDIR}/${NAME}.xcframework"