Avoid curl_easy_setopt error logs (#1641)

Due to an issue between the curl and openssl libraries the `pixi run
build` tasks failed.
In JuliaLang/Downloads.jl#244 the cause of the
issue is gfound to be environment variables being set that conflict.
This commit adds an environment variable to the tasks failing, clearing
the SSL variables

---------

Co-authored-by: Martijn Visser <[email protected]>

pixi.toml

@@ -30,9 +30,9 @@ install = { depends_on = [
     "install-pre-commit",
 ] }
 # Julia
-update-registry-julia = "julia --eval='using Pkg; Registry.update()'"
-update-manifest-julia = "julia --project --eval='using Pkg; Pkg.update()'"
-instantiate-julia = { cmd = "julia --project --eval='using Pkg; Pkg.instantiate()'", env = { JULIA_SSL_CA_ROOTS_PATH = "" } }
+# Clear SSL_CERT_DIR to avoid Julia warnings, see https://github.com/JuliaLang/Downloads.jl/issues/244
+update-registry-julia = { cmd = "julia --eval='using Pkg; Registry.update()'", env = { SSL_CERT_DIR = "" } }
+instantiate-julia = { cmd = "julia --project --eval='using Pkg; Pkg.instantiate()'", env = { SSL_CERT_DIR = "" } }
 initialize-julia = { depends_on = [
     "update-registry-julia",
     "instantiate-julia",
@@ -70,7 +70,7 @@ lint = { depends_on = [
 build = { "cmd" = "julia --project build.jl", cwd = "build", depends_on = [
     "generate-testmodels",
     "initialize-julia",
-], env = { JULIA_SSL_CA_ROOTS_PATH = "" } }
+], env = { SSL_CERT_DIR = "", JULIA_SSL_CA_ROOTS_PATH = "" } }
 remove-artifacts = "julia --eval 'rm(joinpath(Base.DEPOT_PATH[1], \"artifacts\"), force=true, recursive=true)'"
 # Tests
 test-ribasim-cli = "pytest --numprocesses=4 --basetemp=build/tests/temp --junitxml=report.xml build/tests"