Simplify temporary file handling in CI scripts (#2680)

.github/workflows/ci.yml

@@ -137,10 +137,9 @@ jobs:
 
       - name: Install awscli2
         run: |
-          cd /tmp
           # TODO: pin version to work around https://github.com/gaul/s3proxy/issues/760
-          curl "https://awscli.amazonaws.com/AWSCLIV2-2.22.35.pkg" -o "AWSCLIV2.pkg"
-          sudo installer -pkg AWSCLIV2.pkg -target /
+          curl "https://awscli.amazonaws.com/AWSCLIV2-2.22.35.pkg" -o /tmp/AWSCLIV2.pkg
+          sudo installer -pkg /tmp/AWSCLIV2.pkg -target /
 
       - name: Build
         run: |

.github/workflows/linux-ci-helper.sh

@@ -197,14 +197,9 @@ java -version
 if [ "${AWSCLI_DIRECT_INSTALL}" -eq 1 ]; then
     echo "${PRGNAME} [INFO] Install awscli2 package."
 
-    CURRENT_DIR=$(pwd)
-    cd /tmp || exit 1
-
-    curl "${AWSCLI_URI}" -o "${AWSCLI_ZIP_FILE}"
-    unzip  "${AWSCLI_ZIP_FILE}"
-    ./aws/install
-
-    cd "${CURRENT_DIR}" || exit 1
+    curl "${AWSCLI_URI}" -o "/tmp/${AWSCLI_ZIP_FILE}"
+    unzip "/tmp/${AWSCLI_ZIP_FILE}" -d /tmp
+    /tmp/aws/install
 fi
 
 #-----------------------------------------------------------