Add mesa snapshot overlay

overlay-debs/mesa-snapshot/README.md

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+The following changes are being made as our delta against the base packaging
+(in `debian/changelog` format):
+
+```
+  [ Dmitry Baryshkov ]
+  * New upstream snapshot to evaluate upstream Mesa on the RB1 board.
+  * Backport to trixie:
+    - Revert to building with LLVM 19 since 20 is not in trixie.
+    - Drop packages: libxatracker2, libxatracker-dev,
+      libd3dadapter9-mesa, libd3dadapter9-mesa-dev.
+    - Build against librust-rustc-hash-2-dev, not librust-rustc-hash-dev.
+    - Update libegl-mesa0.symbols.
+    - d/mesa-opencl-icd.install: drop some files.
+    - d/p/35316.patch: freedreno: Add sampling support for RGB/BGR
+      24-bit component texture formats.
+    - d/p/etnaviv-add-support-for-texelfetch.patch: drop.
+    - debian/patches/path_max.diff: refresh for context only.
+    - debian/rules:
+      + enable relevant OpenCL drivers by default. Opt-in and use the
+        gallium-rusticl-enable-drivers in order to enable RustiCL drivers which
+        can be enabled by default: asahi, freedreno and radeonsi.
+      + Disable gallium-xa and gallium-opencl=icd.
+      + No longer need to remove mme_{fermi,tu104}_sim_hw_test
+    - debian/control regenerated from debian/control.in.
+```

overlay-debs/mesa-snapshot/mesa-snapshot.sh

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+#! /bin/sh
+#
+# Copyright (c) Qualcomm Technologies, Inc. and/or its subsidiaries.
+# SPDX-License-Identifier: BSD-3-Clause
+
+COMMIT=${COMMIT:-origin/main}
+
+set -e
+
+# Reported by shellcheck: SC2153 (info): Possible misspelling: DSC_FILE may not
+# be assigned. Did you mean DEB_FILE?
+#
+# DSC_FILE is guaranteed to be defined as part of the call API from build-deb.py
+# shellcheck disable=SC2153
+DEB_FILE=${DSC_FILE%%.dsc}.debian.tar.xz
+ORIG_FILE=$(echo "${DSC_FILE}" | sed -e 's/-.*/.orig.tar.xz/')
+
+rm -rf mesa
+git clone --depth 1 https://gitlab.freedesktop.org/mesa/mesa
+
+cd mesa
+git fetch --depth 1 origin "${COMMIT##origin/}"
+
+date=$(git log -1 --format=%cd --date=format:%Y%m%d "${COMMIT}")
+subject=$(git log -1 --format="%h (\"%s\")" "${COMMIT}")
+version=25.2.0~git${date}
+
+rm -rf ../mesa-"${version}"
+mkdir ../mesa-"${version}"
+git archive --format=tar HEAD | tar x -C ../mesa-"${version}"
+
+cd ../mesa-"${version}"
+
+rm -rf debian
+tar xJf "${DEB_FILE}"
+
+cat >> debian/changelog.tmp << EOF
+mesa (${version}-0qcom1) experimental; urgency=medium
+
+  * Build git version from ${date}, commit ${subject}
+
+ -- Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>  Wed, 11 Jun 2025 14:58:50 +0300
+
+EOF
+cat debian/changelog >> debian/changelog.tmp
+mv debian/changelog.tmp debian/changelog
+
+# orig.tar.xz generation skips all .git* files, drop them from the source dir too.
+rm -rf .git*
+
+debian/rules regen_control
+debian/rules clean
+debian/rules gentarball
+
+rm -rf ../mesa
+
+rm "${DSC_FILE}" "${DEB_FILE}" "${ORIG_FILE}"*

overlay-debs/mesa-snapshot/mesa-snapshot.yaml

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+dsc_url: "https://snapshot.debian.org/archive/debian/20250519T203618Z/pool/main/m/mesa/mesa_25.1.0-1.dsc"
+dsc_sha256sum: "d06c1b0ee300f096de2ac59a2e9583349ca79322612f4502baa5e78ff0be4290"
+debdiff_file: "mesa_25.2.0.debdiff"
+script: mesa-snapshot.sh
+suite: trixie
+env:
+  COMMIT: de1ce0f75e98f6fcdc8b7a7b495f54a2060a5896