workflows: _really_ fix Boost caching?..

actions/cache@v2 doesn't work on windows-2016 images, since those
contain the GNU tar, which cannot work with \ as path separator.  This
was fixed in package @actions/cache v1.0.5, which is used by action
actions/[email protected] [1][2].

In addition, it simply couldn't find tar.exe on those images thanks to
my action cleanup-path, which removed the corresponding directory (I
think it was Git's bin/) from PATH.  It worked for windows-2019 images
thanks to them containing tar.exe in System32.  Solved by turning
cleanup-path into a JavaScript action with a "post" step, which restores
the original PATH value.

[1]: actions/runner-images#480
[2]: actions/toolkit#632

.github/workflows/basic.yml

@@ -37,10 +37,10 @@ jobs:
           python-version: '3.x'
 
       - name: Cache Boost
-        uses: actions/cache@v2
+        uses: actions/cache@v2.1.4
         with:
           path: boost_*.tar.gz
-          key: ${{ runner.os }}-boost-1.72.0
+          key: boost-1.72.0
 
       - name: Build Boost
         run: |

.github/workflows/boost_clang_windows.yml

@@ -35,13 +35,13 @@ jobs:
         uses: actions/checkout@v2
 
       - name: Cache Boost
-        uses: actions/cache@v2
+        uses: actions/cache@v2.1.4
         with:
           path: '${{ runner.workspace }}/boost/boost_*.tar.gz'
-          key: '${{ runner.os }}-boost-${{ matrix.boost-version }}'
+          key: 'boost-${{ matrix.boost-version }}'
 
       - name: Clean up PATH
-        uses: egor-tensin/cleanup-path@v1
+        uses: egor-tensin/cleanup-path@v2
         if: runner.os == 'Windows'
 
       - name: Set common variables

.github/workflows/boost_toolsets.yml

@@ -111,13 +111,13 @@ jobs:
         uses: actions/checkout@v2
 
       - name: Cache Boost
-        uses: actions/cache@v2
+        uses: actions/cache@v2.1.4
         with:
           path: '${{ runner.workspace }}/boost/boost_*.tar.gz'
-          key: '${{ runner.os }}-boost-${{ matrix.boost-version }}'
+          key: 'boost-${{ matrix.boost-version }}'
 
       - name: Clean up PATH
-        uses: egor-tensin/cleanup-path@v1
+        uses: egor-tensin/cleanup-path@v2
         if: runner.os == 'Windows'
 
       - name: Set common variables

.github/workflows/ci_appveyor.yml

@@ -46,10 +46,10 @@ jobs:
           python-version: '3.x'
 
       - name: Cache Boost
-        uses: actions/cache@v2
+        uses: actions/cache@v2.1.4
         with:
           path: C:\projects\boost_*.tar.gz
-          key: '${{ runner.os }}-boost-${{ env.boost_version }}'
+          key: 'boost-${{ env.boost_version }}'
 
       - name: Create C:\projects
         run: mkdir C:\projects

.github/workflows/ci_github.yml

@@ -46,10 +46,10 @@ jobs:
           python-version: '3.x'
 
       - name: Cache Boost
-        uses: actions/cache@v2
+        uses: actions/cache@v2.1.4
         with:
           path: '${{ runner.workspace }}/boost_*.tar.gz'
-          key: '${{ runner.os }}-boost-${{ env.boost_version }}'
+          key: 'boost-${{ env.boost_version }}'
 
       - name: Build Boost
         run: python -m project.ci.boost -- --with-filesystem

.github/workflows/ci_travis.yml

@@ -43,10 +43,10 @@ jobs:
           python-version: '3.x'
 
       - name: Cache Boost
-        uses: actions/cache@v2
+        uses: actions/cache@v2.1.4
         with:
           path: '${{ env.HOME }}/boost_*.tar.gz'
-          key: '${{ runner.os }}-boost-${{ env.boost_version }}'
+          key: 'boost-${{ env.boost_version }}'
 
       - name: Build Boost
         run: python -m project.ci.travis.boost -- --with-filesystem

.github/workflows/cygwin_static_libstdc++.yml

@@ -30,7 +30,7 @@ jobs:
         uses: actions/checkout@v2
 
       - name: Clean up PATH
-        uses: egor-tensin/cleanup-path@v1
+        uses: egor-tensin/cleanup-path@v2
         if: runner.os == 'Windows'
 
       - name: Set common variables

.github/workflows/example_toolsets.yml

@@ -75,7 +75,7 @@ jobs:
         uses: actions/checkout@v2
 
       - name: Clean up PATH
-        uses: egor-tensin/cleanup-path@v1
+        uses: egor-tensin/cleanup-path@v2
         if: runner.os == 'Windows'
 
       - name: Set common variables