Add archive repo to fix Debian 10 task (#1038)

* fix Debian 10 Earthly tasks

* copy debian directory in Earthly environment

Author: kevinAlbs

.evergreen/earthly.sh

@@ -6,13 +6,6 @@ set -euo pipefail
 
 : "${EARTHLY_VERSION:=0.7.8}"
 
-# Bring in the debian/ directory from the debian/unstable branch
-pushd "$(dirname "${BASH_SOURCE[0]}")/../"
-    (git remote | grep -q upstream) || git remote add upstream https://github.com/mongodb/libmongocrypt
-    git fetch upstream
-    git checkout $(git rev-parse upstream/debian/unstable) -- debian
-popd
-
 # Calc the arch of the executable we want
 arch="$(uname -m)"
 case "$arch" in

Earthfile

@@ -189,6 +189,10 @@ ENV_DEBIAN:
         COPY +get-deb-signing-keys/keys/deb10-archive-signing-key.gpg /etc/apt/trusted.gpg.d
         COPY +get-deb-signing-keys/keys/deb11-archive-signing-key.gpg /etc/apt/trusted.gpg.d
     END
+    IF [ $version = "10.0" ]
+        # Update source list for archived Debian buster packages.
+        RUN echo "deb http://archive.debian.org/debian buster main" > /etc/apt/sources.list
+    END
     DO +DEBIAN_SETUP
 
 env.deb9:
@@ -241,7 +245,6 @@ COPY_SOURCE:
         cmake/ \
         kms-message/ \
         test/ \
-        debian/ \
         src/ \
         doc/ \
         etc/ \
@@ -316,13 +319,15 @@ deb-build:
     RUN __install git-buildpackage fakeroot debhelper cmake libbson-dev \
                   libintelrdfpmath-dev
     DO +COPY_SOURCE
+    # Bring in the debian/ directory from the debian/unstable branch
+    GIT CLONE https://github.com/mongodb/libmongocrypt --branch debian/unstable libmongocrypt-debian
     WORKDIR /s/libmongocrypt
     RUN git clean -fdx && git reset --hard
     RUN python3 etc/calc_release_version.py > VERSION_CURRENT
     RUN git add -f VERSION_CURRENT && \
         git -c user.name=anon -c user.email=anon@localhost \
             commit VERSION_CURRENT -m 'Set version' && \
-        env LANG=C bash debian/build_snapshot.sh && \
+        env LANG=C bash libmongocrypt-debian/debian/build_snapshot.sh && \
         debc ../*.changes && \
         dpkg -i ../*.deb
     SAVE ARTIFACT /s/*.deb /debs/