Added transifex-specific build environment image

See https://github.com/azahar-emu/azahar/issues/592

transifex/Dockerfile

@@ -0,0 +1,23 @@
+FROM debian:bookworm
+
+ENV DEBIAN_FRONTEND=noninteractive
+
+# Update repos + upgrade system
+RUN apt-get update && apt-get -y full-upgrade
+
+# Install package dependencies
+RUN apt-get install -y \
+    clang \
+    cmake \
+    curl \
+    git \
+    qt6-base-dev \
+    qt6-l10n-tools \
+    qt6-multimedia-dev \
+    qt6-tools-dev \
+    qt6-tools-dev-tools \
+    libxext-dev
+
+# Download Transifex client
+RUN curl -o- https://raw.githubusercontent.com/transifex/cli/master/install.sh | bash
+RUN mv /tx /usr/bin/