ci: just set required env globally

(backport <rust-lang#3891>)
(cherry picked from commit 7294016)

Author: tgross35

.github/workflows/full_ci.yml

@@ -6,6 +6,9 @@ on:
     branches:
       - libc-0.2
 
+env:
+  LIBC_CI: 1
+
 jobs:
   docker_linux_tier1:
     name: Docker Linux Tier1
@@ -21,7 +24,7 @@ jobs:
       - name: Setup Rust toolchain
         run: TARGET=${{ matrix.target }} sh ./ci/install-rust.sh
       - name: Execute run-docker.sh
-        run: LIBC_CI=1 sh ./ci/run-docker.sh ${{ matrix.target }}
+        run: sh ./ci/run-docker.sh ${{ matrix.target }}
 
   macos:
     name: macOS
@@ -36,7 +39,7 @@ jobs:
       - name: Setup Rust toolchain
         run: TARGET=${{ matrix.target }} sh ./ci/install-rust.sh
       - name: Execute run.sh
-        run: LIBC_CI=1 sh ./ci/run.sh ${{ matrix.target }}
+        run: sh ./ci/run.sh ${{ matrix.target }}
 
   windows:
     name: Windows
@@ -66,7 +69,7 @@ jobs:
         run: TARGET=${{ matrix.target }} sh ./ci/install-rust.sh
         shell: bash
       - name: Execute run.sh
-        run: LIBC_CI=1 sh ./ci/run.sh ${{ matrix.target }}
+        run: sh ./ci/run.sh ${{ matrix.target }}
         shell: bash
 
   style_check:
@@ -116,7 +119,7 @@ jobs:
       - name: Setup Rust toolchain
         run: TARGET=${{ matrix.target }} sh ./ci/install-rust.sh
       - name: Execute run-docker.sh
-        run: LIBC_CI=1 sh ./ci/run-docker.sh ${{ matrix.target }}
+        run: sh ./ci/run-docker.sh ${{ matrix.target }}
 
   # These targets are tier 3 or otherwise need to have CI build std via -Zbuild-std.
   # Because of this, only the nightly compiler can be used on these targets.
@@ -183,7 +186,7 @@ jobs:
       - name: Setup Rust toolchain
         run: TOOLCHAIN=${{ matrix.toolchain }} sh ./ci/install-rust.sh
       - name: Execute build.sh
-        run: LIBC_CI=1 TOOLCHAIN=${{ matrix.toolchain }} sh ./ci/build.sh
+        run: TOOLCHAIN=${{ matrix.toolchain }} sh ./ci/build.sh
 
   build_channels_macos:
     name: Build Channels macOS
@@ -204,7 +207,7 @@ jobs:
       - name: Setup Rust toolchain
         run: TOOLCHAIN=${{ matrix.target.toolchain }} sh ./ci/install-rust.sh
       - name: Execute build.sh
-        run: LIBC_CI=1 TOOLCHAIN=${{ matrix.target.toolchain }} sh ./ci/build.sh
+        run: TOOLCHAIN=${{ matrix.target.toolchain }} sh ./ci/build.sh
 
   build_channels_windows:
     name: Build Channels Windows
@@ -226,7 +229,7 @@ jobs:
         run: rustup self update
         shell: bash
       - name: Execute build.sh
-        run: LIBC_CI=1 TOOLCHAIN=${{ matrix.toolchain }} sh ./ci/build.sh
+        run: TOOLCHAIN=${{ matrix.toolchain }} sh ./ci/build.sh
         shell: bash
 
   check_cfg:
@@ -237,7 +240,7 @@ jobs:
       - name: Setup Rust toolchain
         run: TOOLCHAIN=nightly sh ./ci/install-rust.sh
       - name: Build with check-cfg
-        run: LIBC_CI=1 LIBC_CHECK_CFG=1 cargo build -Z unstable-options -Z check-cfg
+        run: LIBC_CHECK_CFG=1 cargo build -Z unstable-options -Z check-cfg
 
   # One job that "summarizes" the success state of this pipeline. This can then be added to branch
   # protection, rather than having to add each job separately.