fix: use full CA chain in buildkit image

buildkit/Dockerfile

@@ -1,3 +1,3 @@
 FROM moby/buildkit:buildx-stable-1
-COPY intermediate-ca.crt /usr/local/share/ca-certificates/intermediate-ca.crt
+COPY ca-chain.crt /usr/local/share/ca-certificates/ca-chain.crt
 RUN apk add --no-cache ca-certificates && update-ca-certificates

buildkit/ca-chain.crt

@@ -1,4 +1,38 @@
 -----BEGIN CERTIFICATE-----
+MIIF8zCCA9ugAwIBAgICEAAwDQYJKoZIhvcNAQELBQAwgYoxCzAJBgNVBAYTAkRF
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+-----END CERTIFICATE-----
+-----BEGIN CERTIFICATE-----
 MIIGBzCCA++gAwIBAgIUDkrlPsBijsQfGXRnhmcHZmuxD/0wDQYJKoZIhvcNAQEL
 BQAwgYoxCzAJBgNVBAYTAkRFMQ8wDQYDVQQIDAZIZXNzZW4xEzARBgNVBAcMCkdl
 aXNlbmhlaW0xEDAOBgNVBAoMB1ByaXZhdGUxCzAJBgNVBAsMAklUMRgwFgYDVQQD

buildkit/intermediate-ca.crt

@@ -1,34 +0,0 @@
------BEGIN CERTIFICATE-----
-MIIF8zCCA9ugAwIBAgICEAAwDQYJKoZIhvcNAQELBQAwgYoxCzAJBgNVBAYTAkRF
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------END CERTIFICATE-----