Add nightly ARM & IBM platform builds

.github/workflows/platforms.yml

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+name: Platform builds
+
+on:
+  schedule: [cron: '0 14 * * *']
+
+jobs:
+  build_linux_platforms:
+    runs-on: ubuntu-latest
+    name: ${{ matrix.conf.name }}
+    if: github.event_name != 'pull_request' || contains('dreamer,kcgen,ant-222', github.actor) == false
+    strategy:
+      matrix:
+        conf:
+          - name: ARMv6 (Debian Buster)
+            architecture: armv6
+            distribution: buster
+          - name: ARMv7 (Debian Buster)
+            architecture: armv7
+            distribution: buster
+          - name: AArch64 (Ubuntu 18.04)
+            architecture: aarch64
+            distribution: ubuntu18.04
+          - name: LinuxONE (Ubuntu 18.04)
+            architecture: s390x
+            distribution: ubuntu18.04
+          - name: POWER8 (Ubuntu 18.04)
+            architecture: ppc64le
+            distribution: ubuntu18.04
+    steps:
+      - uses: actions/checkout@v2
+
+      - name: Check repo for commits
+        id: repo-meta
+        shell: bash
+        run:  'echo ::set-output name=has-commits::$(./scripts/has-commits-since.sh "24 hours ago")'
+
+      - uses: uraimo/run-on-arch-action@master
+        if: steps.repo-meta.outputs.has-commits == 'true'
+        with:
+          architecture: ${{ matrix.conf.architecture }}
+          distribution: ${{ matrix.conf.distribution }}
+          run: |
+            set -x
+            apt-get update
+            apt-get install -y $(./scripts/list-build-dependencies.sh -c gcc -m apt)
+            ./scripts/log-env.sh
+            ./scripts/build.sh -c gcc -t release

scripts/automator/build/gcc-linux_aarch64

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+# GCC flags for generically identified AArch64
+# Note: Advanced SIMD (aka NEON) is mandatory for AArch64 and implied
+cflags_release+=(-mcpu=native -mstrict-align)

scripts/automator/build/gcc-linux_armv6

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+# GCC flags for generically identified ARMv6 SBCs
+cflags_release+=(-marm -mfpu=vfpv2 -mfloat-abi=hard)

scripts/automator/build/gcc-linux_armv7l

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+# GCC flags for generically identified ARMv7 SBCs
+
+# Note: NEON SIMD instructions for floating-point operations are 
+# not generated by GCC’s auto-vectorization pass unless 
+# -funsafe-math-optimizations is also specified. This is because 
+# NEON hardware does not fully implement the IEEE 754 standard for 
+# some floating-point arithmetic operations, specifically 
+# "denormal" values are treated as zero, so in these corner-cases, 
+# the use of NEON instructions may lead to a loss of precision. 
+# For our purposes, we expect to perform normal calculations and 
+# thus accept this risk for release builds.
+
+cflags_release+=(-mcpu=generic-armv7-a -march=armv7-a -mfloat-abi=hard
+                 -funsafe-math-optimizations -mfpu=auto)

scripts/automator/build/gcc-linux_ppc64le

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+# GCC flags specific to the IBM POWER8 platform
+cflags_release+=(-mcpu=power8)

scripts/automator/build/gcc-linux_s390x

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+# GCC flags for the IBM S/390 and zSeries platform
+
+# Defaults include:
+#  -mlong-double-128, 128-bit long doubles
+#  -m64, generate 64-bit instructions
+#  -mfused-madd, use floating point multiply and accumulate instructions
+
+cflags_release+=(-march=native -mhard-float)