integration-ebpf: add cargo config

Same reasoning as the one in bpf.

bpf/.cargo/config.toml

@@ -6,7 +6,7 @@
 # ignored if you run from the workspace root. See
 # https://doc.rust-lang.org/cargo/reference/config.html#hierarchical-structure
 [build]
-target = "bpfel-unknown-none"
+target = ["bpfeb-unknown-none", "bpfel-unknown-none"]
 
 [unstable]
 build-std = ["core"]

test/integration-ebpf/.cargo/config.toml

@@ -0,0 +1,12 @@
+# We have this so that one doesn't need to manually pass
+# --target=bpfel-unknown-none -Z build-std=core when running cargo
+# check/build/doc etc.
+#
+# NB: this file gets loaded only if you run cargo from this directory, it's
+# ignored if you run from the workspace root. See
+# https://doc.rust-lang.org/cargo/reference/config.html#hierarchical-structure
+[build]
+target = ["bpfeb-unknown-none", "bpfel-unknown-none"]
+
+[unstable]
+build-std = ["core"]