Auto merge of rust-lang#89486 - rusticstuff:docker_letsencrypt_ca_upd…

…ate, r=Mark-Simulacrum

Update Let's Encrypt ROOT CA certificate in dist-(i686|x86_64)-linux docker images

The DST Root CA X3 used by Let's Encrypt has expired ([Let's Encrypt announcement](https://letsencrypt.org/docs/dst-root-ca-x3-expiration-september-2021/)). This patch installs the new root certificate (ISRG Root X1) and disables the old one. Disabling the old one is necessary because otherwise curl still fails to download from servers with Let's Encrypt certs even though they are cross-signed.

Fixes rust-lang#89484.

src/ci/docker/host-x86_64/dist-i686-linux/Dockerfile

@@ -34,6 +34,11 @@ RUN apt-get update && \
       xz-utils \
       zlib1g-dev
 
+# Install new Let's Encrypt root CA certificate and remove the expired one.
+COPY host-x86_64/shared/ISRG_Root_X1.crt /usr/local/share/ca-certificates/ISRG_Root_X1.crt
+RUN sed -i '/mozilla\/DST_Root_CA_X3\.crt/d' /etc/ca-certificates.conf
+RUN /usr/sbin/update-ca-certificates
+
 ENV PATH=/rustroot/bin:$PATH
 ENV LD_LIBRARY_PATH=/rustroot/lib64:/rustroot/lib32:/rustroot/lib
 ENV PKG_CONFIG_PATH=/rustroot/lib/pkgconfig

src/ci/docker/host-x86_64/dist-x86_64-linux/Dockerfile

@@ -34,6 +34,11 @@ RUN apt-get update && \
       xz-utils \
       zlib1g-dev
 
+# Install new Let's Encrypt root CA certificate and remove the expired one.
+COPY host-x86_64/shared/ISRG_Root_X1.crt /usr/local/share/ca-certificates/ISRG_Root_X1.crt
+RUN sed -i '/mozilla\/DST_Root_CA_X3\.crt/d' /etc/ca-certificates.conf
+RUN /usr/sbin/update-ca-certificates
+
 ENV PATH=/rustroot/bin:$PATH
 ENV LD_LIBRARY_PATH=/rustroot/lib64:/rustroot/lib32:/rustroot/lib
 ENV PKG_CONFIG_PATH=/rustroot/lib/pkgconfig

src/ci/docker/host-x86_64/shared/ISRG_Root_X1.crt

@@ -0,0 +1,31 @@
+-----BEGIN CERTIFICATE-----
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+-----END CERTIFICATE-----