Add support for prebuilt packages, ezurio-qca-firmware, all arch

(couldn't MR, see https://salsa.debian.org/casparvitch/reform-debian-packages for commits or diff below)

• support prebuilt deb packages, primarily to allow for ezurio-qca-firmware (deb included here)
• setup.sh is updated to allow all arch -> I am not certain this is required? But the firmware package is arch: all.
• build_custom.sh updated to use reprepro includedeb if deb files found in prebuilt/

Untested

diff --git a/build_custom.sh b/build_custom.sh
index 8078578..a65278b 100755
--- a/build_custom.sh
+++ b/build_custom.sh
@@ -44,3 +44,7 @@ END
 	dpkg-deb --root-owner-group --build "$WORKDIR" .
 	rm -Rf "$WORKDIR"
 fi
+
+if [ -d prebuilt ] && [ -n "$(ls -A prebuilt/*.deb 2>/dev/null)" ]; then
+	reprepro --verbose includedeb "$OURSUITE" prebuilt/*.deb
+fi
diff --git a/prebuilt/ezurio-qca-firmware_0.0~git20230404.bad01ca-2+salsaci+20240912+7_all.deb b/prebuilt/ezurio-qca-firmware_0.0~git20230404.bad01ca-2+salsaci+20240912+7_all.deb
new file mode 100644
index 0000000..2739c17
Binary files /dev/null and b/prebuilt/ezurio-qca-firmware_0.0~git20230404.bad01ca-2+salsaci+20240912+7_all.deb differ
diff --git a/setup.sh b/setup.sh
index 68d5674..2b12f4d 100755
--- a/setup.sh
+++ b/setup.sh
@@ -23,7 +23,7 @@ Codename: $OURSUITE
 Label: $OURLABEL
 Suite: $OURSUITE
 Origin: $OURORIGIN
-Architectures: $HOST_ARCH $(test "$BUILD_ARCH" = "$HOST_ARCH" || echo "$BUILD_ARCH") source
+Architectures: $HOST_ARCH $(test "$BUILD_ARCH" = "$HOST_ARCH" || echo "$BUILD_ARCH") all source
 Components: main
 UDebComponents: main
 Contents: .xz
@@ -38,7 +38,7 @@ Codename: ${OURSUITE%-backports}
 Label: $OURLABEL
 Suite: ${OURSUITE%-backports}
 Origin: $OURORIGIN
-Architectures: $HOST_ARCH $(test "$BUILD_ARCH" = "$HOST_ARCH" || echo "$BUILD_ARCH") source
+Architectures: $HOST_ARCH $(test "$BUILD_ARCH" = "$HOST_ARCH" || echo "$BUILD_ARCH") all source
 Components: main
 UDebComponents: main
 Contents: .xz